EXHIBIT 1.1


                                2,000,000 SHARES

                            DATAMETRICS CORPORATION

                                  COMMON STOCK

                               __________________

                             UNDERWRITING AGREEMENT
                               __________________



                                                            Radnor, Pennsylvania
                                                                    May __, 1995


Pennsylvania Merchant Group Ltd
Cruttenden Roth Incorporated
  As Representatives of the Several Underwriters
  Named in Schedule I Attached Hereto
Suite 390, Fidelity Court
259 Radnor-Chester Road
Radnor, Pennsylvania  19087


Dear Sirs:

     Datametrics Corporation, a Delaware corporation (the "Company"), proposes 
to issue and sell an aggregate of 2,000,000 shares of its Common Stock, $0.01 
par value (the "Common Shares"), to Pennsylvania Merchant Group Ltd ("PMG") and
Cruttenden Roth Incorporated (collectively with PMG, the "Representatives") and
the several underwriters named in Schedule I hereto (collectively with the
Representatives, the "Underwriters" and individually, an "Underwriter," which
terms shall also include any Underwriter substituted as hereinafter provided in
Section 11).  The aforementioned 2,000,000 Common Shares to be issued and sold
to the several Underwriters by the Company are hereinafter referred to as the
"Offered Shares."  The Offered Shares shall be offered to the public at an
initial offering price of $__________ per Offered Share (the "Offering Price").

     In addition, the several Underwriters, in order to cover over-allotments in
the sale of the Offered Shares, may purchase from the Company within 30 business
days after the Effective Date (as hereinafter defined), for their own account
for offering to the public at the Offering Price, up to 300,000 additional
Common Shares (the "Optional Shares"), upon the terms and conditions set forth
in Section 4 hereof.  The Offered Shares and the Optional Shares are hereinafter
collectively referred to as the "Shares."  The Company, intending to be legally
bound hereby, confirms its agreement with each of the Underwriters as follows:

 
     1.  REPRESENTATIONS AND WARRANTIES.  The Company represents and warrants 
to, and agrees with, the several Underwriters that:

               (a) The Company has prepared in conformity with the requirements
          of the Securities Act of 1933, as amended (the "Act"), and the rules,
          regulations, releases and instructions (the "Regulations") of the
          Securities and Exchange Commission (the "SEC") under the Act in effect
          at all applicable times and has filed with the SEC a registration
          statement on Form S-2 (File No. 33-________) and one or more
          amendments thereto registering the Shares under the Act.  Any
          preliminary prospectus included in such registration statement or
          filed with the SEC pursuant to Rule 424(a) of the Regulations is
          hereinafter called a "Preliminary Prospectus."  The various parts of
          such registration statement, including all exhibits thereto and the
          information contained in any form of final prospectus filed with the
          SEC pursuant to Rule 424(b) of the Regulations in accordance with
          Section 5(a) of this Agreement and deemed by virtue of Rule 430A of
          the Regulations to be part of such registration statement at the time
          it was declared effective, each as amended at the time such
          registration statement became effective, are hereinafter collectively
          referred to as the "Registration Statement."  The final prospectus in
          the form included in the Registration Statement or first filed with
          the SEC pursuant to Rule 424(b) of the Regulations and any amendments
          or supplements thereto is hereinafter referred to as the "Prospectus."

               (b) The Registration Statement has become effective under the Act
          as of the Effective Date, and the SEC has not issued any stop order
          suspending the effectiveness of the Registration Statement or
          preventing or suspending the use of any Preliminary Prospectus nor has
          the SEC instituted, threatened to institute or, to the Company's
          knowledge, contemplated proceedings with respect to such an order.  No
          stop order suspending the sale of the Shares in any jurisdiction
          designated by the Representatives pursuant to Section 5(f) hereof has
          been issued, and no proceedings for that purpose have been instituted
          or are threatened or, to the Company's knowledge, contemplated.  The
          Company has complied with any request of the SEC, or any state
          securities commission in a state designated by the Representatives
          pursuant to Section 5(f) hereof, for additional information to be
          included in the Registration Statement or Prospectus or otherwise.
          Each Preliminary Prospectus conformed to the Act and the Regulations
          as of its date and did not as of its date contain an untrue statement
          of material fact or omit to state a material fact required to be
          stated therein or necessary to make the statements therein, in light
          of the circumstances under which they were made, not misleading,
          except the foregoing shall not apply to statements in or omissions
          from any Preliminary Prospectus in reliance upon and in conformity
          with information furnished to the Company in writing by or on behalf
          of any Underwriter through the Representatives expressly for use
          therein.  The Registration Statement on the date on which it was
          declared effective by the SEC (the "Effective Date") conformed, and
          any post-effective amendment thereof on the date it shall become
          effective, and the Prospectus at the time it is filed with the SEC
          pursuant to Rule 424(b) of the Regulations and on the Closing Date (as
          defined in Section 3 hereof) and any Option Closing Date (as defined
          in Section 4(b) hereof), will conform to the requirements of the Act
          and the Regulations, and neither the Registration Statement, any post-
          effective amendment

                                       2

 
          thereof nor the Prospectus will, on any of such respective dates,
          contain any untrue statement of a material fact or omit to state any
          material fact required to be stated therein or necessary to make the
          statements therein not misleading, except that this representation and
          warranty does not apply to statements in or omissions from the
          Registration Statement or the Prospectus made in reliance upon and in
          conformity with information furnished to the Company in writing by or
          on behalf of any Underwriter through the Representatives expressly for
          use therein.  It is understood that the statements appearing in any
          Preliminary Prospectus, the Prospectus or the Registration Statement
          (A) on the inside front cover page with respect to stabilization, (B)
          in the table in the section entitled "Underwriting," and the second
          paragraph following such table with respect to the amount of the
          dealers' concession and allowance and reallowance discount and (C) in
          the section entitled "Legal Matters" with respect to the identity of
          counsel for the Underwriters constitute the only information furnished
          in writing by or on behalf of any Underwriter for inclusion in any
          Preliminary Prospectus, the Prospectus or the Registration Statement.

               (c) The Company is a corporation duly organized, validly existing
          and in good standing under the laws of Delaware, with all necessary
          power and authority, corporate and other, and all required licenses,
          permits, certifications, registrations, approvals, consents and
          franchises to own or lease and operate its properties and to conduct
          its business as described in the Prospectus and to execute, deliver
          and perform this Agreement.  The Company is duly qualified to do
          business and is in good standing as a foreign corporation in each
          jurisdiction in which the nature of its business or its ownership or
          leasing of property requires such qualification, except where the
          failure to be so qualified would not have a material adverse effect on
          the Company.

               (d) The Company does not own any stock or other equity interest
          in, or control, directly or indirectly, any corporation, partnership
          or other entity other than Datametrics, Limited, which has no assets
          and conducts no business.

               (e) The Company has all necessary power and authority to execute
          and deliver the Warrants to purchase Common Shares to be issued and
          sold to the Representatives under the terms of Warrant Agreement (as
          hereinafter defined) in accordance with Section 5(r) of this Agreement
          (the "Representatives Warrants").

               (f) This Agreement, the Warrant Agreement and the Representatives
          Warrants have been duly authorized, executed and delivered by the
          Company and constitute its legal, valid and binding obligations,
          enforceable against the Company in accordance with their respective
          terms, except as rights to indemnity and contribution hereunder or
          thereunder may be limited by federal or state securities laws or
          principles of public policy.  This Agreement, the Warrant Agreement
          and the Representatives Warrants conform to the description thereof in
          the Prospectus.

               (g) The execution, delivery and performance of this Agreement,
          the Warrant Agreement and the Representatives Warrants by the Company
          does not and will not, with or without the giving of notice or the
          lapse of time, or both, (A) conflict with any terms or provisions of
          the Certificate of Incorporation or

                                       3

 
          By-laws of the Company, as amended to the date hereof and the Closing
          Date or Option Closing Date, as the case may be; (B) result in a
          breach of, constitute a default under, result in the termination or
          modification of or result in the creation or imposition of any lien,
          security interest, charge or encumbrance upon any of the properties of
          the Company pursuant to any indenture, mortgage, deed of trust,
          contract, commitment or other agreement or instrument to which the
          Company is a party or by which any of its properties or assets are
          bound or affected; (C) violate any law, rule, regulation, judgment,
          order or decree of any government or governmental agency,
          instrumentality or court, domestic or foreign, having jurisdiction
          over the Company or any of its properties or businesses or (D) result
          in a breach, termination or lapse of the power and authority of the
          Company to own or lease and operate its properties and conduct its
          business as described in the Prospectus.

               (h) The Company has authorized and outstanding capital stock and,
          as of the date or dates indicated the Company had the capitalization,
          set forth under the caption "Capitalization" in the Prospectus and
          will have the as-adjusted capitalization set forth under the caption
          "Capitalization" in the Prospectus.  On the Effective Date, the
          Closing Date and any Option Closing Date, there will be no options or
          warrants for the purchase of, other outstanding rights to purchase,
          agreements or obligations to issue or agreements or other rights to
          convert or exchange any obligation or security into, capital stock of
          the Company or securities convertible into or exchangeable for capital
          stock of the Company, except as described in the Prospectus with
          respect to the outstanding options that have been granted to employees
          and directors to purchase 1,419,290 Common Shares (the "Employee
          Options"), the outstanding warrants to purchase 170,000 Common Shares
          (the "Warrants"), the Representatives Warrants and the Over-allotment
          Option (as hereinafter defined).

               (i) The authorized capital stock of the Company, including,
          without limitation, the outstanding Common Shares and the Shares being
          issued on the Closing Date and Option Closing Date (if any and to the
          extent applicable), conforms to the descriptions thereof in the
          Prospectus, and such descriptions conform to the descriptions thereof
          set forth in the instruments defining the same.  The information in
          the Prospectus insofar as it relates to the Employee Options, the
          Representatives Warrants and the Warrants, in each case as of the
          Effective Date, the Closing Date and any Option Closing Date, is true,
          correct and complete.

               (j) The outstanding Common Shares have been duly authorized and
          are validly issued, fully paid and non-assessable.  The Employees
          Options and the Warrants have been duly authorized and validly issued
          and are legal, valid and binding obligations enforceable against the
          Company in accordance with their terms.  The Warrant Agreement and the
          Representatives Warrants, as of the Closing Date, will have been duly
          authorized and validly issued and, when executed and delivered by the
          Company, will be legal, valid and binding obligations enforceable
          against the Company in accordance with their terms.  The Common Shares
          issuable pursuant to the Employee Options, the Representatives
          Warrants and the Warrants, when issued in accordance with the
          respective terms thereof, will be duly authorized, validly issued,
          fully paid and non-assessable.  None of such outstanding Common
          Shares,

                                       4

 
          Employee Options, or Warrants were, and none of the Representatives
          Warrants or such issuable Common Shares will be, issued in violation
          of any preemptive rights of any security holder of the Company.  The
          Company has reserved a sufficient number of Common Shares for issuance
          pursuant to the Employee Options, the Representatives Warrants and the
          Warrants.  The holders of the outstanding Common Shares are not, and
          will not be, subject to personal liability solely by reason of being
          such holders, and the holders of the Common Shares issuable pursuant
          to the Employee Options, the Representatives Warrants and the Warrants
          will not be subject to personal liability solely by reason of being
          such holders.   The offers and sales of the outstanding Common Shares,
          the Employee Options and the Warrants were, and the issuance of the
          Common Shares pursuant to the Employee Options, the Representatives
          Warrants and the Warrants will be, made in conformity with applicable
          registration requirements or exemptions therefrom under federal and
          applicable state securities laws.

               (k) The issuance and sale of the Shares by the Company have been
          duly authorized and, when the Shares have been duly delivered against
          payment therefor as contemplated by this Agreement, the Shares will be
          validly issued, fully paid and non-assessable, and the holders thereof
          will not be subject to personal liability solely by reason of being
          such holders.  None of the Shares will be issued in violation of any
          preemptive rights of any stockholder of the Company.  The certificates
          representing the Shares are in proper legal form under, and conform to
          the requirements of the Delaware General Corporation Law, as amended
          (the "GCL").  Neither the filing of the Registration Statement nor the
          offering or sale of the Shares as contemplated by this Agreement gives
          any security holder of the Company any rights, other than those which
          have been waived, for or relating to the registration of any Common
          Shares or other security of the Company.

               (l) No consent, approval, authorization, order, registration,
          license or permit of any court, government, governmental agency,
          instrumentality or other regulatory body or official is required for
          the valid authorization, issuance, sale and delivery by the Company of
          any of the Shares, or for the execution, delivery or performance by
          the Company of this Agreement, except such as may be required for the
          registration of the Shares under the Act, the Regulations and the
          Securities Exchange Act of 1934, as amended (the "Exchange Act"),
          which consent, approval and authorization have been obtained, and for
          compliance with the applicable state securities or Blue Sky laws, or
          the By-laws, rules and other pronouncements of the National
          Association of Securities Dealers, Inc. (the "NASD").  Upon the
          effectiveness of the Registration Statement, the Common Shares will be
          registered pursuant to Section 12(g) of the Exchange Act, and will be
          included on the American Stock Exchange (the "AMEX").  The Company has
          taken no action designed, or likely, to have the effect of terminating
          the registration of the Common Shares under Section 12(g) of the
          Exchange Act or the inclusion of the Common Shares on the AMEX, nor
          has the Company received any notification that the SEC or the AMEX is
          contemplating terminating such registration or inclusion.

               (m) The statements in the Registration Statement and Prospectus,
          insofar as they are descriptions of or references to contracts,
          agreements or other documents,

                                       5

 
          are accurate in all material respects and present or summarize fairly,
          the information required to be disclosed under the Act and the
          Regulations, and there are no contracts, agreements or other documents
          required to be described or referred to in the Registration Statement
          or Prospectus or to be filed as exhibits to the Registration Statement
          under the Act or the Regulations that have not been so described,
          referred to or filed, as required.

               (n) The financial statements (including the notes thereto) filed
          as part of any Preliminary Prospectus, the Prospectus and the
          Registration Statement present fairly the financial position of the
          Company, as of the respective dates thereof, and the results of
          operations and cash flows of the Company, for the periods indicated
          therein, all in conformity with generally accepted accounting
          principles consistently applied.  The supporting schedules included in
          the Registration Statement fairly state the information required to be
          stated therein in relation to the basic financial statements taken as
          a whole.  The financial information included in the Prospectus under
          the captions "Prospectus Summary" and "Selected Financial Data"
          presents fairly the information shown therein and has been compiled on
          a basis consistent with that of the audited financial statements
          included in the Registration Statement.

               (o) Since the respective dates as of which information is given
          in the Registration Statement and the Prospectus, except as otherwise
          stated therein, there has not been (A) any material adverse change
          (including, whether or not insured against, any material loss or
          damage to any assets), or development involving a prospective material
          adverse change, in the general affairs, properties, assets,
          management, condition (financial or otherwise), results of operations,
          stockholders' equity, business or prospects of the Company, (B) any
          transaction entered into by the Company that is material to the
          Company, (C) any dividend or distribution of any kind declared, paid
          or made by the Company on its capital stock, (D) any liabilities or
          obligations, direct or indirect, incurred by the Company that are
          material to the Company, or (E) any material change in the short-term
          debt or long-term debt of the Company.  The Company does not have any
          contingent liabilities or obligations that are material and that are
          not disclosed in the Prospectus.

               (p) The Company has not distributed and, prior to the later to
          occur of the Closing Date, the Option Closing Date or the completion
          of the distribution of the Shares, will not distribute any offering
          material in connection with the offering or sale of the Shares other
          than the Registration Statement, each Preliminary Prospectus and the
          Prospectus, in any such case only as permitted by the Act and the
          Regulations.

               (q) The Company has filed with the appropriate federal, state and
          local governmental agencies, and all foreign countries and political
          subdivisions thereof, all tax returns that are required to be filed,
          or has duly obtained extensions of time for the filing thereof and has
          paid all taxes shown on such returns and all assessments received by
          it to the extent that the same have become due.  The Company has not
          executed or filed with any taxing authority, foreign or domestic, any
          agreement extending the period for assessment or collection of any
          income taxes, is not a party to any pending action or proceeding by
          any foreign or domestic governmental

                                       6

 
          agencies for the assessment or collection of taxes, and no claims for
          assessment or collection of taxes have been asserted against the
          Company that might materially adversely affect the general affairs,
          properties, assets, condition (financial or otherwise), results of
          operations, stockholders' equity, business or prospects of the
          Company.

               (r) Ernst & Young LLP, which is certifying the financial
          statements included in the Prospectus and forming a part of the
          Registration Statement, is a firm of independent public accountants as
          required by the Act and the Regulations.

               (s) The Company is not in violation of, or in default under, any
          of the terms or provisions, of (A) its Certificate of Incorporation or
          Bylaws, each as amended to the date hereof, the Closing Date or the
          Option Closing Date, as the case may be, (B) any indenture, mortgage,
          deed of trust, contract, loan or credit agreement, commitment or other
          agreement or instrument to which the Company is a party or by which it
          or any of its properties are bound or affected, (C) any law, rule,
          regulation, judgment, order or decree of any government or
          governmental agency, instrumentality or court, domestic or foreign,
          having jurisdiction over the Company or any of its properties or
          businesses or (D) any license, permit, certification, registration,
          approval, consent or franchise referred to in subsections (b) or (c)
          of this Section 1.

               (t) There are no claims, actions, suits, proceedings,
          arbitrations investigations, or inquiries pending before, or
          threatened or, to the Company's knowledge, contemplated by, any
          governmental agency, instrumentality, court or tribunal, domestic or
          foreign, or before any private arbitrational tribunal, relating to or
          affecting the Company or its properties or businesses that might
          affect the issuance or validity of any of the Shares or the validity
          of any of the outstanding Common Shares, or that, if determined
          adversely to the Company, would, in any case or in the aggregate,
          result in any material adverse change in the general affairs,
          properties, assets, condition (financial or otherwise), results of
          operations, stockholders' equity, business or prospects, of the
          Company; nor is there any reasonable basis for any such claim, action,
          suit, proceeding, arbitration, investigation or inquiry.  There are no
          outstanding orders, judgments or decrees of any court, governmental
          agency, instrumentality or other tribunal enjoining the Company from,
          or requiring the Company to take or refrain from taking any action, or
          to which the Company, or any of its properties, assets or businesses
          is bound or subject.

               (u) The Company owns, or possesses adequate rights to use all
          patents, patent applications, trademarks, trademark registrations,
          applications for trademark registration, trade names, service marks,
          licenses, inventions, copyrights, know-how (including trade secrets
          and other unpatented and/or unpatentable proprietary or confidential
          technology, information, systems, design methodologies and devices or
          procedures developed or derived from the Company's businesses), trade
          secrets, confidential information, processes and formulations
          necessary for, used in or proposed to be used in the conduct of its
          business as described in the Prospectus (collectively, the
          "Intellectual Property") that, if not so owned or possessed, would
          materially adversely affect the general affairs, properties, condition
          (financial or

                                       7

 
          otherwise), results of operations, stockholders' equity, business or
          prospects of the Company.  The Company has not infringed, is not
          infringing or has not received any notice of conflict with the
          asserted rights of others with respect to the Intellectual Property,
          and no others have infringed upon or are in conflict with the
          Intellectual Property.

               (v) The Company has obtained all permits, licenses and other
          authorizations that are required, to the extent required, under all
          environmental laws, including but not limited to the Federal Water
          Pollution Control Act (33 U.S.C. (S)1251 et seq.), Resource
          Conservation & Recovery Act (42 U.S.C. (S)6901 et seq.), Safe Drinking
          Water Act (21 U.S.C. (S)349, 42 U.S.C. (S)(S)201, 300f), Toxic
          Substances Control Act (15 U.S.C. (S)2601 et seq.), Clean Air Act (42
          U.S.C. (S) 7401 et seq.), Comprehensive Environmental Response,
          Compensation and Liability Act (42 U.S.C. (S)9601 et seq.), other
          appropriate laws of jurisdictions in which the Company's products have
          been used or located and any other laws relating to emissions,
          discharges, releases or threatened releases of pollutants,
          contaminants, chemicals or industrial, toxic or hazardous substances
          or wastes into the environment (including, without limitation, ambient
          air, surface water, ground water or land), or otherwise relating to
          the manufacture, processing, distribution, use, treatment, storage,
          disposal, transport or handling of pollutants, contaminants, chemicals
          or industrial, toxic or hazardous substances or wastes under any
          regulation, code, plan, order, decree, judgment, injunction, notice or
          demand letter issued, entered, promulgated or approved thereunder
          (collectively, the "Environmental Laws").  The Company is in
          compliance with all terms and conditions of any required permits,
          licenses and authorizations, and is in compliance with all other
          limitations, restrictions, conditions, standards, prohibitions,
          requirements, obligations, schedules, and timetables contained in the
          Environmental Laws, except where the failure to so comply would not
          have a material adverse effect on the Company.

               (w) There are no present or, to the Company's knowledge, past
          events, conditions, circumstances, activities, practices, incidents,
          actions or plans relating to the business as presently being conducted
          by the Company that interfere with or prevent compliance with or
          continued compliance with the Environmental Laws, or which would be
          reasonably likely to give rise to any material legal liability
          (whether statutory or common law) or otherwise would be reasonably
          likely to form the basis of any claim, action, demand, suit,
          proceeding, hearing, notice of violation, study, investigation,
          remediation, or clean up based on or related to the generation,
          manufacture, processing, distribution, use, treatment, storage,
          disposal, transport or handling, or the emission, discharge, release
          into the workplace, community or environment of any pollutant,
          contaminant, chemical or industrial, toxic, or hazardous substance or
          waste.

               (x) The Company has good and marketable title to all personal
          property (tangible and intangible) described in the Prospectus as
          being owned by it, free and clear of all liens, security interests,
          charges or encumbrances, except such as are described in the
          Prospectus.  The Company has adequately insured the personal property
          of the Company against loss or damage by fire or other casualty and
          maintains, in adequate amounts, insurance against such other risks as
          management

                                       8

 
          of the Company deems appropriate.  The Company does not own any real
          property, and all real property used or leased by the Company, as
          described in the Prospectus (the "Premises"), is held by the Company
          under a valid, subsisting and enforceable lease.  The Premises, and
          all operations conducted thereon, are now and, since the Company began
          to use such Premises, always have been and, to the Company's
          knowledge, prior to when the Company began to use such Premises,
          always had been, in compliance with the Environmental Laws.  There is
          no, and the Company has not received notice of any, claim, demand,
          investigation, regulatory action, suit or other action instituted or
          threatened against any of them or the Premises relating to any of the
          Environmental Laws.  The Company has not received any notice of
          material violation, citation, complaint, order, directive, request for
          information or response thereto, notice letter, demand letter or
          compliance schedule to or from any governmental or regulatory agency
          arising out of or in connection with hazardous substances (as defined
          by applicable Environmental Laws) on, about, beneath, arising from or
          generated at the Premises.

               (y) The Company maintains a system of internal accounting
          controls sufficient to provide reasonable assurances that (A)
          transactions are executed in accordance with management's general or
          specific authorization, (B) transactions are recorded as necessary in
          order to permit preparation of financial statements in accordance with
          generally accepted accounting principles and to maintain
          accountability for assets, (C) access to assets is permitted only in
          accordance with management's general or specific authorization and (D)
          the recorded accountability for assets is compared with existing
          assets at reasonable intervals and appropriate action is taken with
          respect to any differences.

               (z) No unregistered securities of the Company have been sold by
          the Company or on behalf of the Company by any person or persons
          controlling, controlled by or under common control with the Company
          within the three years prior to the date hereof, except as disclosed
          in the Registration Statement.

               (aa) Each contract or other instrument (however characterized or
          described) to which the Company is a party or by which any of the
          properties or business of it is bound or affected and to which
          reference has been made in the Prospectus or which has been filed as
          an exhibit to the Registration Statement has been duly and validly
          executed by the Company, and by the other parties thereto.  Except as
          described in the Prospectus, each such contract or other instrument is
          in full force and effect and is enforceable against the parties
          thereto in accordance with its terms, and neither the Company, nor any
          other party is in default thereunder and no event has occurred that,
          with the lapse of time or the giving of notice, or both, would
          constitute a default thereunder.

               (bb) Except for the Company's 401(k), disability, health and life
          insurance plans, the Company has not had any employee benefit plan,
          profit sharing plan, employee pension benefit plan or employee welfare
          benefit plan or deferred compensation arrangements (collectively,
          "Plans") that are subject to the provisions of the Employee Retirement
          Income Security Act of 1974, as amended, or the rules and regulations
          thereunder ("ERISA").  All Plans that are subject to ERISA are, and

                                       9

 
          have been at all times since their establishment, in compliance with
          ERISA and, to the extent required by the Internal Revenue Code of
          1986, as amended (the "Code"), in compliance with the Code.  The
          Company has not had any employee pension benefit plan that is subject
          to Part 3 of Subtitle B of Title 1 of ERISA or any defined benefit
          plan or multiemployer plan.  The Company has not maintained retiree
          life and retiree health insurance plans that are employee welfare
          benefit plans providing for continuing benefit or coverage for any
          employee or any beneficiary of any employee after such employee's
          termination for employment, except as required by Section 4980B of the
          Code.  No fiduciary or other party in interest with respect to any of
          the Plans has caused any of such Plans to engage in a "prohibited
          action" as defined in Section 406 of ERISA.  As used in this
          subsection, the terms "defined benefit plan," "employee benefit plan,"
          "employee pension benefit plan," "employee welfare benefit plan,"
          "fiduciary" and "multiemployer plan" shall have the respective
          meanings assigned to such terms in Section 3 of ERISA.

               (cc) No labor dispute exists with the employees of the Company
          and no such labor dispute is imminent.  There is no existing or, to
          the Company's knowledge, imminent labor disturbance by the employees
          of any of the Company's principal suppliers, contractors or customers
          (including, without limitation, any distributors or end-users of its
          products).

               (dd) The Company has not incurred any liability for any finder's
          fees or similar payments in connection with the transactions
          contemplated herein.

               (ee) Except as described in the Prospectus, the Company is not a
          party to, and is not bound by, any agreement pursuant to which any
          material royalties, honoraria or fees are payable by the Company to
          any person by reason of the ownership or use of any Intellectual
          Property.

               (ff) Except as disclosed in the Prospectus, there are no business
          relationships or related party transactions required to be disclosed
          therein by Item 404 of Regulation S-K of the Regulations.

               (gg) The Company is familiar with the Investment Company Act of
          1940, as amended (the "1940 Act"), and the rules and regulations
          thereunder, and has in the past conducted, and intends in the future
          to continue to conduct, its affairs in such a manner to ensure that it
          will not become an "investment company" within the meaning of the 1940
          Act and such rules and regulations.

               (hh) Neither the Company nor any director, officer, agent,
          employee or other person associated with or acting on behalf of the
          Company has, directly or indirectly, (A) used any corporate funds for
          unlawful contributions, gifts, entertainment or other unlawful
          expenses relating to any political activity, (B) made any unlawful
          payment to foreign or domestic governments or governmental officials
          or employees or to foreign or domestic political parties or campaigns
          from corporate funds, (C) violated any provision of the Foreign
          Corrupt Practices Act of 1977, as amended or (D) made any bribe,
          rebate, payoff, influence payment, kickback or other unlawful payment.

                                       10

 
     Any certificate signed by any officer of the Company in such capacity and
     delivered to the Representatives or to counsel for the Underwriters
     pursuant to this Agreement shall be deemed a representation and warranty by
     the Company to the several Underwriters as to the matters covered thereby.

     2.   PURCHASE AND SALE OF OFFERED SHARES.  On the basis of the
representations, warranties, covenants and agreements herein contained, but
subject to the terms and conditions herein set forth, the Company shall sell the
Offered shares to the several Underwriters at the Offering Price less the
underwriting discount shown on the cover page of the Prospectus (the
"Underwriting Discount"), and the Underwriters, severally and not jointly, shall
purchase from the Company, on a firm commitment basis, at the Offering Price
less the Underwriting Discount, the respective Offered Shares set forth opposite
their names on Schedule I hereto.  In making this Agreement, each Underwriter is
contracting severally, and not jointly, and, except as provided in Sections 4
and 11 hereof, the agreement of each Underwriter is to purchase only that number
of Offered shares specified with respect to that Underwriter in Schedule I
hereto.  The Underwriters shall offer the Offered Shares to the public as set
forth in the Prospectus.

     3.   PAYMENT AND DELIVERY.  Payment for the Offered Shares shall be made to
the Company by certified or official bank check payable to the order of the
Company in Philadelphia Clearing House funds (next day funds), at the offices of
Latham & Watkins, 633 West Fifth Street, Los Angeles, California 90071, or at
such other location as shall be agreed upon by the Company and the
Representatives, or in immediately available funds wired to such account or
accounts as the Company may specify (with all costs and expenses incurred by the
Underwriters in connection with such settlement in immediately available funds
(including, but not limited to, interest or cost of funds expenses) to be born
by the Company), against delivery of the Offered Shares to the Representatives
at the offices of PMG, Suite 390, Fidelity Court, 259 Radnor-Chester Road,
Radnor, Pennsylvania 19087, for the respective accounts of the Underwriters.
Such payments and delivery will be made at 10:00 A.M., Philadelphia time, on the
fifth business day after the date of this Agreement or at such other time and
date not later than five business days thereafter as the Representatives and the
Company shall agree upon.  Such time and date are referred to herein as the
"Closing Date."  The certificates representing the Offered Shares to be sold and
delivered will be in such denominations and registered in such names as the
Representatives request not less than two full business days prior to the
Closing Date, and will be made available to the Representatives for inspection,
checking and packaging at the office of the Company's Transfer Agent, not less
than one full business day prior to the Closing Date.

     4.   OPTION TO PURCHASE OPTIONAL SHARES.

          (a) For the purposes of covering any over-allotments in connection
     with the distribution and sale of the Offered Shares as contemplated by the
     Prospectus, subject to the terms and conditions herein set forth, the
     several Underwriters are hereby granted an option by the Company to
     purchase all or any part of the Optional Shares from the Company (the
     "Over-allotment Option").  The purchase price per share to be paid for the
     Optional Shares shall be the Offering Price less the Underwriting Discount.
     The Over-allotment Option granted hereby may be exercised by the
     Representatives on behalf of the several Underwriters as to all or any part
     of the Optional Shares at any time and from time to time within 30 business
     days after the Effective Date.  No Underwriter shall be under any
     obligation to purchase any Optional Shares prior to an exercise of the
     Over-allotment Option.

                                       11

 
          (b) The Over-allotment Option granted hereby may be exercised by the
     Representatives on behalf of the several Underwriters by giving notice to
     the Company by a letter sent by registered or certified mail, postage
     prepaid, telex, telegraph, telegram or facsimile (such notice to be
     effective when sent), addressed as provided in Section 13 hereof, setting
     forth the number of Optional Shares to be purchased, the date and time for
     delivery of and payment for the Optional Shares and stating that the
     Optional Shares referred to therein are to be used for the purpose of
     covering over-allotments in connection with the distribution and sale of
     the Offered Shares.  If such notice is given prior to the Closing Date, the
     date set forth therein for such delivery and payment shall not be earlier
     than either five full business days thereafter or the Closing Date,
     whichever occurs later.  If such notice is given on or after the Closing
     Date, the date set forth therein for such delivery and payment shall be a
     date selected by the Representatives that is not later than five full
     business days after the exercise of the Over-allotment Option.  The date
     and time set forth in such a notice is referred to herein as an "Option
     Closing Date," and a closing held pursuant to such a notice is referred to
     herein as an "Option Closing."  The number of Optional Shares to be sold to
     each Underwriter pursuant to each exercise of the Over-allotment Option
     shall be the number that bears the same ratio to the aggregate number of
     Optional Shares being purchased through such Over-allotment Option exercise
     as the number of Offered Shares opposite the name of such Underwriter in
     Schedule I hereto bears to the total number of all Offered Shares; subject,
     however, to such adjustment as the Representatives may approve to eliminate
     fractional shares and subject to the provisions for the allocation of
     Optional Shares purchased for the purpose of covering over-allotments set
     forth in Section 9 of the Agreement Among Underwriters.  Upon each exercise
     of the Over-allotment Option, the Company shall become obligated and sell
     to the Representatives for the respective accounts of the Underwriters, and
     on the basis of the representations, warranties, covenants and agreements
     herein contained, but subject to the terms and conditions herein set forth,
     and the several Underwriters shall become severally, but not jointly,
     obligated to purchase from the Company, the number of Optional Shares
     specified in each notice of exercise of the Over-allotment Option.

          (c) Payment for the Optional Shares shall be made to the Company by
     certified or official bank check payable to the order of the Company in
     Philadelphia Clearing House funds (next day funds), at the office of Latham
     & Watkins, 633 West Fifth Street, Los Angeles, California 90071, or such
     other location as shall be agreed upon by the Company and the
     Representatives, or in immediately available funds wired to such account as
     the Company may specify (with all costs and expenses incurred by the
     Underwriters in connection with such settlement in immediately available
     funds (including, but not limited to, interest or cost of funds expenses)
     to be borne by the Company), against delivery of the Optional Shares to the
     Representatives at the offices of PMG, Suite 390, Fidelity Court, 259
     Radnor-Chester Road, Radnor, Pennsylvania 19087, for the respective
     accounts of the Underwriters.  The certificates representing the Optional
     Shares to be issued and delivered will be in such denominations and
     registered in such names as the Representatives request not less than two
     full business days prior to the Option Closing Date, and will be made
     available to the Representatives for inspection, checking and packaging at
     the office of the Company's Transfer Agent not less than one full business
     day prior to the Option Closing Date.

                                       12

 
     5.   CERTAIN COVENANTS AND AGREEMENTS OF THE COMPANY.  The Company
covenants and agrees with the several Underwriters as follows:

          (a) If Rule 430A of the Regulations is employed, the Company will
     timely file the Prospectus pursuant to and in compliance with Rule 424(b)
     of the Regulations and will advise the Representatives of the time and
     manner of such filing.

          (b) The Company will not at any time, whether before or after the
     Registration Statement shall have become effective, during such period as,
     in the opinion of counsel for the Underwriters, the Prospectus is required
     by law to be delivered in connection with sales by the Underwriters or a
     dealer, file or publish any amendment or supplement to the Registration
     Statement or Prospectus of which the Representatives have not been
     previously advised and furnished a copy, or which is not in compliance with
     the Regulations, or, during the period before the distribution of the
     Offered Shares and the Optional Shares is completed, file or publish any
     amendment or supplement to the Registration Statement or Prospectus to
     which the Representatives reasonably object in writing.

          (c) The Company will use its best efforts to cause the Registration
     Statement, if not effective at the time and date that this Agreement is
     executed and delivered by the parties hereto, to become effective and will
     advise the Representatives immediately, and confirm such advice in writing,
     (i) when the Registration Statement, or any post-effective amendment to the
     Registration Statement, is filed with the SEC, (ii) of the receipt of any
     comments from the SEC, (iii) when the Registration Statement has become
     effective and when any post-effective amendment thereto becomes effective,
     or when any supplement to the Prospectus or any amended Prospectus has been
     filed, (iv) of any request of the SEC for amendment or supplementation of
     the Registration Statement or Prospectus or for additional information, (v)
     during the period when the Prospectus is required to be delivered under the
     Act and Regulations, of the happening of any event which in the Company's
     judgment makes any material statement in the Registration Statement or the
     Prospectus untrue or which requires any changes to be made in the
     Registration Statement or Prospectus in order to make any material
     statements therein not misleading and (vi) of the issuance by the SEC of
     any stop order suspending the effectiveness of the Registration Statement
     or of any order preventing or suspending the use of any Preliminary
     Prospectus or the Prospectus, the suspension of the qualification of any of
     the Shares for offering or sale in any jurisdiction in which the
     Underwriters intend to make such offers or sales, or of the initiation or
     threatening of any proceedings for any such purposes.  The Company will use
     its best efforts to prevent the issuance of any such stop order or of any
     order preventing or suspending such use and, if any such order is issued,
     to obtain as soon as possible the lifting thereof.

          (d) The Company has delivered to the Representatives, without charge,
     and will continue to deliver from time to time until the Effective Date, as
     many copies of each Preliminary Prospectus as the Representatives may
     reasonably request.  The Company will deliver to the Representatives,
     without charge, as soon as possible after the Effective Date, and
     thereafter from time to time during the period when delivery of the
     Prospectus is required under the Act, such number of copies of the
     Prospectus (as supplemented or amended, if the Company makes any
     supplements or amendments to the Prospectus) as the Representatives may
     reasonably request.  The Company hereby consents to the use of such copies
     of each Preliminary Prospectus and the Prospectus for purposes permitted by
     the Act,

                                       13

 
     the Regulations and the securities or Blue Sky laws of the jurisdictions in
     which the Shares are offered or sold by the several Underwriters and by all
     dealers to whom Shares may be offered or sold, both in connection with the
     offering and sale of the Shares and for such period of time thereafter as
     the Prospectus is required by the Act to be delivered in connection with
     sales by any Underwriter or dealer.  The Company has furnished or will
     furnish to the Representatives two signed copies of the Registration
     Statement as originally filed and of all amendments thereto, whether filed
     before or after the Effective Date, two copies of all exhibits filed
     therewith and two signed copies of all consents and certificates of
     experts, and will deliver to the Representatives such number of conformed
     copies of the Registration Statement, including financial statements and
     exhibits, and all amendments thereto, as the Representatives may reasonably
     request.

          (e) The Company will comply with the Act, the Regulations, the
     Exchange Act and the rules and regulations thereunder so as to permit the
     continuance of offers and sales of, and dealings in, the Shares for as long
     as may be necessary to complete the distribution of the Shares as
     contemplated hereby.

          (f) The Company will furnish such information as may be required and
     otherwise cooperate in the registration or qualification of the Shares, or
     exemption therefrom, for offering and sale by the several Underwriters and
     by dealers under the securities or Blue Sky laws of such jurisdictions in
     which the Representatives determine to offer the Shares, after consultation
     with the Company, and will file such consents to service of process or
     other documents necessary or appropriate in order to effect such
     registration or qualification; provided, however, that no such
     qualification shall be required in any jurisdiction where, solely as a
     result thereof, the  Company would be subject to taxation or qualification
     as a foreign corporation doing business in such jurisdiction where it is
     not now so qualified or to take any action which would subject it to
     service of process in suits, other than those arising out of the offering
     or sale of the Shares, in any jurisdiction where it is not now so subject.
     The Company will, from time to time, prepare and file such statements and
     reports as are or may be required to continue such qualification in effect
     for so long a period as is required under the laws of such jurisdiction for
     such offering and sale.

          (g) Subject to subsection (b) of this Section 5, in case of any event,
     at any time within the period during which, in the opinion of counsel for
     the Underwriters, a prospectus is required to be delivered under the Act
     and Regulations, as a result of which event any Preliminary Prospectus or
     the Prospectus, as then amended or supplemented, would contain, in the
     judgment of the Company or in the opinion of counsel for the Underwriters,
     an untrue statement of a material fact, or omit to state any material fact
     necessary in order to make the statements therein, in light of the
     circumstances under which they were made, not misleading, or, if it is
     necessary at any time to amend any Preliminary Prospectus or the Prospectus
     to comply with the Act and Regulations or any applicable securities or Blue
     Sky laws, the Company promptly will prepare and file with the SEC, and any
     applicable state securities commission, an amendment or supplement that
     will correct such statement or omission or an amendment that will effect
     such compliance and will furnish to the Representatives such number of
     copies of such amendment or amendments or supplement or supplements to such
     Preliminary Prospectus or the Prospectus (in form and substance
     satisfactory to the Representatives and counsel for Underwriters) as the
     Representatives may reasonably request.  For purposes of this subsection,
     the Company will furnish such information to the

                                       14

 
     Representatives, the Underwriters' counsel and counsel for the Company as
     shall be necessary to enable such persons to consult with the Company with
     respect to the need to amend or supplement any Preliminary Prospectus or
     the Prospectus, and shall furnish to the Representatives and the
     Underwriters' counsel such further information as each may from time to
     time reasonably request.  If the Company and the Representatives agree that
     any Preliminary Prospectus or the Prospectus should be amended or
     supplemented, the Company, if requested by the Representatives, will, if
     and to the extent required by law, promptly issue a press release
     announcing or disclosing the matters to be covered by the proposed
     amendment or supplement.

          (h) The Company will make generally available to its security holders
     as soon as practicable and in any event not later than 45 days after the
     end of the period covered thereby, an earnings statement of the Company
     (which need not be audited unless required by the Act, the Regulations, the
     Exchange Act or the rules or regulations thereunder) that shall comply with
     Section 11(a) of the Act and cover a period of at least 12 consecutive
     months beginning not later than the first day of the Company's fiscal
     quarter next following the Effective Date.

          (i) For a period of five years from the Effective Date, the Company
     will deliver to the Representatives:  (A) a copy of each report or
     document, including, without limitation, reports on Forms 8-K, 10-C, 10-K
     and 10-Q (or such similar forms as may be designated by the SEC),
     registration statements and any exhibits thereto, filed with or furnished
     to the SEC or any securities exchange or the NASD, on the date each such
     report or document is so filed or furnished, (B) as soon as practicable,
     copies of any reports or communications (financial or other) of the Company
     mailed to its security holders and (C) every material press release in
     respect of the Company or its affairs that was released or prepared by the
     Company.

          (j) For a period of three years from the Effective Date, the Company
     will deliver to the Representatives, subject to execution of an appropriate
     confidentiality agreement, such additional information concerning the
     business and financial condition of the Company and its subsidiaries as the
     Representatives may from time to time reasonably request in writing,and
     which can be prepared or obtained by the Company without unreasonable
     effort or expense.

          (k) During the course of the distribution of the Shares, the Company
     has not taken, nor will it take, directly or indirectly, any action
     designed to or that might, in the future, reasonably be expected to cause
     or result in stabilization or manipulation of the price of the Common
     Shares.

          (l) The Company will cause each person listed on Schedule II hereto to
     execute a legally binding and enforceable agreement (a "lockup agreement")
     to, for a period of 120 days from the Effective Date, not sell, offer to
     sell, contract to sell, grant any option for the sale of or otherwise
     transfer or dispose of any Common Shares (except for the sale of the Shares
     as contemplated by this Agreement), any options to purchase Common Shares
     or any securities convertible into or exchangeable for Common Shares
     (excluding the issuance of Common Shares pursuant to the Employee Options)
     without the prior written consent of PMG, which lockup agreement shall be
     in form and substance satisfactory to the

                                       15

 
     Representatives and the Underwriters' counsel, and deliver such lockup
     agreement to the Representatives prior to the Effective Date.  Appropriate
     stop transfer instructions will be issued by the Company to the transfer
     agent for the securities affected by the lockup agreements.

          (m) The Company will not sell, issue, contract to sell, offer to sell
     or otherwise dispose of any Common Shares, options to purchase Common
     Shares or any other security convertible into or exchangeable for Common
     Shares, from the date of the Effective Date through the period ending 120
     days after the Effective Date, without the prior written consent of PMG,
     except for the sale of the Shares as contemplated by this Agreement, the
     granting of options, and the issuance of Common Shares upon their exercise,
     under the Company's stock option plans described in the Prospectus, the
     issuance of Common Shares pursuant to the Employee Options and the Warrants
     and the issuance of the Representatives Warrants.

          (n) The Company will use all reasonable efforts to maintain the
     inclusion of the Common Shares on the AMEX.

          (o) The Company shall, at its sole cost and expense, supply and
     deliver to the Representatives and the Underwriters' counsel (in the form
     they require), within a reasonable period after the Closing Date, six
     transaction binders, each of which shall include the Registration
     Statement, as amended or supplemented, all exhibits to the Registration
     Statement, each Preliminary Prospectus, the Prospectus, the Preliminary
     Blue Sky Memorandum and any supplement thereto and all underwriting and
     other closing documents.

          (p) Upon the Representatives' request, individually and not as the
     Representatives of the several Underwriters, the Company shall make
     available its stock transfer records for examination by the Representatives
     at the offices of the Company's transfer agent for a period of 12 months
     after the Effective Date.

          (q) The Company will use the net proceeds from the sale of the Shares
     to be sold by it hereunder substantially in accordance with the description
     thereof set forth in the Prospectus and shall file such reports with the
     SEC with respect to the sale of such Shares and the application of the
     proceeds therefrom as may be required in accordance with Rule 463 under the
     Act.

          (r) On the Closing Date, the Company shall sell to the
     Representatives, at a purchase price of $0.001 per share, Representatives
     Warrants to purchase 200,000 Common Shares.  Such Representatives Warrants
     shall be issued pursuant to the terms of the Warrant Agreement and shall
     have an exercise price per share equal to 120 percent of the Offering
     Price, shall be exercisable during the period beginning on the first
     anniversary of the Effective Date and ending on the fifth anniversary of
     the Effective Date, shall contain customary anti-dilution and registration
     rights provisions and shall otherwise be in a form that is acceptable to
     the Representatives and their counsel.

     6.   PAYMENT OF EXPENSES.

          (a) Whether or not the transactions contemplated by this Agreement are
     consummated and regardless of the reason this Agreement is terminated, the
     Company will

                                       16

 
     pay or cause to be paid, and bear or cause to be borne, all costs and
     expenses incident to the performance of the obligations of the Company
     under this Agreement, including:  (i) the fees and expenses of the
     accountants and counsel for the Company incurred in the preparation of the
     Registration Statement and any post-effective amendments thereto (including
     financial statements and exhibits), each Preliminary Prospectus and the
     Prospectus and any amendments or supplements thereto; (ii) printing and
     mailing expenses associated with the Registration Statement and any post-
     effective amendments thereto, each Preliminary Prospectus, the Prospectus
     (including any supplement thereto), this Agreement, the Agreement Among
     Underwriters, the Underwriters' Questionnaire, the Power of Attorney, the
     Selected Dealer Agreement and related documents and the Preliminary Blue
     Sky Memorandum and any supplement thereto; (iii) the costs (other than fees
     and expenses of the Underwriters' counsel except in connection with Blue
     Sky filings or exemptions as provided herein) incident to the
     authentication, issuance, delivery and transfer of the Shares to the
     Underwriters; (iv) all taxes, if any, on the issuance, delivery and
     transfer of the Shares to be sold by the Company; (v) the fees, expenses
     and all other costs of qualifying the Shares for the sale under the
     securities or Blue Sky laws of those jurisdictions in which the Shares are
     to be offered or sold including the reasonable fees and disbursements of
     Underwriters' counsel and such local counsel as may have been reasonably
     required and retained for such purpose; (vi) the fees, expenses and other
     costs of, or incident to, securing any review or approvals by or from the
     NASD exclusive of fees of the Underwriters' counsel; (vii) the filing fees
     of the SEC; (viii) the cost of furnishing to the Underwriters copies of the
     Registration Statement, each Preliminary Prospectus and the Prospectus
     (including any supplement or amendment thereto) as herein provided; (ix)
     the Company's travel expenses in connection with meetings with the
     brokerage community and institutional investors and expenses associated
     with hosting such meetings, including meeting rooms, meals, facilities and
     ground transportation expenses; (x) the costs and expenses associated with
     settlement in same day funds (including, but not limited to, interest or
     cost of funds expenses), if desired by the Company; (xi) the fees for
     inclusion of the Shares on the AMEX; (xii) the cost of printing and
     engraving certificates for the Shares; (xiii) the cost and charges of any
     transfer agent; and (xiv) all other costs and expenses reasonably incident
     to the performance of its obligations hereunder that are not otherwise
     specifically provided for in this Section 6, provided that, except as
     specifically set forth in subsection (c) of this Section 6, the
     Underwriters shall be responsible for their out-of-pocket expenses,
     including their lodging and travel expenses associated with meetings with
     the brokerage community and institutional investors, and the fees and
     expenses of their counsel for other than Blue Sky work.

          (b) The Company shall pay as due any registration, qualification and
     filing fees and any accountable out-of-pocket disbursements in connection
     with such registration, qualification or filing in the jurisdictions in
     which the Representatives determine, after consultation with the Company,
     to offer or sell the Shares.

          (c) In order to reimburse the Representatives for those costs and
     expenses customarily incurred during the registration process, in the event
     the issuance and sale of the Offered Shares to the several Underwriters is
     not consummated as contemplated by this Agreement, the Company shall
     reimburse the Representatives for all of their out-of-pocket expenses
     incurred in connection with the offering of the Offered Shares (including
     but not limited to the fees and disbursements of its counsel), in an amount
     not to exceed $75,000.

                                       17

 
     7.  CONDITIONS OF UNDERWRITERS' OBLIGATIONS.  The obligation of each
Underwriter to purchase and pay for the Offered Shares that it has agreed to
purchase hereunder on the Closing Date, and to purchase and pay for any Optional
Shares as to which its right to purchase under Section 4 has been exercised on
an Option Closing Date, is subject at the date hereof, the Closing Date and any
Option Closing Date to the continuing accuracy of the representations and
warranties of the Company set forth herein, to the performance by the Company of
its covenants, agreements and obligations hereunder and to the following
additional conditions:

          (a) The Registration Statement shall have become effective not later
     than 5:30 P.M., Philadelphia time, on the date of this Agreement, or at
     such later time or on such later date as the Representatives may agree to
     in writing; if required by the Regulations, the Prospectus shall have been
     filed with the SEC pursuant to Rule 424(b) of the Regulations within the
     applicable time period prescribed for such filing by the Regulations and in
     accordance with subsection (a) of Section 5 hereof; on or prior to the
     Closing Date or any Option Closing Date, as the case may be, no stop order
     or other order preventing or suspending the effectiveness of the
     Registration Statement or the sale of any of the Shares shall have been
     issued under the act or any state securities law and no proceedings for
     that purpose shall have been initiated or shall be pending or, to the
     Representatives' knowledge or the knowledge of the Company, shall be
     contemplated by the SEC or any authority in any jurisdiction designated by
     the Representatives pursuant to subsection (f) of Section 5 hereof and any
     request on the part of the SEC for additional information shall have been
     complied with to the reasonable satisfaction of counsel for the
     Underwriters.

          (b) All corporate proceedings and other matters incident to the
     authorization, form and validity of this Agreement, the Warrant Agreement,
     the Representatives Warrants and the Shares and the form of the
     Registration Statement, each Preliminary Prospectus and the Prospectus, and
     all other legal matters relating to this Agreement and the transactions
     contemplated hereby, shall be satisfactory in all respects to counsel to
     the Underwriters; the Company shall have furnished to such counsel all
     documents and information that they may reasonably request to enable them
     to pass upon such matters; and the Representatives shall have received from
     the Underwriters' counsel, Stradling, Yocca, Carlson & Rauth, a favorable
     opinion, dated as of the Closing Date and any Option Closing Date, as the
     case may be, and addressed to the Representatives individually and as the
     Representatives of the several Underwriters with respect to the due
     authorization, execution and delivery of this Agreement, that the issuance
     and sale of the Shares have been duly authorized by the Company, that when
     the Shares have been duly delivered against payment therefor as
     contemplated by this Agreement, they will be validly issued, fully paid and
     non-assessable and that the Registration Statement has become effective
     under the Act.

          (c) The NASD shall have indicated that it has no objection to the
     underwriting arrangements pertaining to the sale of any of the Shares.

          (d) The Representatives shall have received copies of the lockup
     agreements described in subsection (l) of Section 5 signed by those persons
     set forth on Schedule II hereto.

          (e) The Representatives shall have received at or prior to the Closing
     Date from the Underwriters' counsel a memorandum or summary, in form and
     substance satisfactory

                                       18

 
     to the Representatives, with respect to the qualification for offering and
     sale by the Underwriters of the Shares under the securities or Blue Sky
     laws of such jurisdictions designated by the Representatives pursuant to
     subsection (f) of Section 5 hereof.

          (f) On the Closing Date and any Option Closing Date, there shall have
     been delivered to the Representatives a signed opinion of Latham & Watkins,
     counsel for the Company ("Company Counsel"), dated as of each such date and
     addressed to the Representatives individually and as the Representatives of
     the several Underwriters to the effect that:

               (i) The Company has been duly incorporated and is validly
          existing as a corporation in good standing under the laws of Delaware,
          with all necessary corporate power and corporate authority to own or
          lease and operate its properties and to conduct its business as
          described in the Prospectus and to execute, deliver and perform this
          Agreement.  The Company is duly qualified to do business as a foreign
          corporation and is in good standing in all jurisdictions in which it
          owns or leases properties, or conducts any business, so as to require
          such qualification, except where the failure so to qualify or be in
          good standing would not have a material adverse effect on the general
          affairs, properties, condition (financial or otherwise), results of
          operations, stockholders' equity or business of the Company.

               (ii) To Company Counsel's knowledge, the Company does not own any
          stock or other equity interest in or control, directly or indirectly,
          any corporation, partnership or other entity other than Datametrics,
          Limited, which has no assets and conducts no business.

               (iii)  The Company has all necessary corporate power and
          corporate authority to execute and deliver the Warrant Agreement and
          the Representatives Warrants.

               (iv) This Agreement and the Warrant Agreement have been duly
          authorized, executed and delivered by the Company and each constitutes
          its legal, valid and binding agreement, enforceable against the
          Company in accordance with its terms, except as rights to indemnity
          and contribution each may be limited by federal or state securities
          laws or principles of public policy.

               (v) The execution, delivery and performance of this Agreement,
          the Warrant Agreement and the Representatives Warrants by the Company
          does not and will not, with or without the giving of notice or the
          lapse of time, or both, (A) conflict with any terms or provisions of
          the Company's Certificate of Incorporation or By-laws, as amended to
          the date hereof and the Closing Date or the Option Closing Date, as
          the case may be; (B) result in a breach of, constitute a default
          under, result in the termination or modification of or result in the
          creation or imposition of any lien, security interest, charge or
          encumbrance upon any of the properties of the Company pursuant to any
          indenture, mortgage, deed of trust, contract, commitment or other
          agreement or instrument known to Company Counsel to which the Company
          is a party or by which any of its properties or assets are bound or
          affected, (C) violate any law, rule or regulation, or any judgment,
          order or

                                       19

 
          decree known to Company Counsel of any government or governmental
          agency, instrumentally or court, domestic or foreign, having
          jurisdiction over the Company or any of properties or assets or (D)
          result in a breach, termination or lapse of the corporate power or
          authority of the Company to own or lease and operate its properties
          and conduct its business as described in the Prospectus.

               (vi) The authorized, issued and outstanding capital stock of the
          Company is as set forth in the Prospectus under the captions
          "Capitalization" and "Description of Capital Stock."  As of the date
          or dates indicated, the Company had the capitalization, and will have
          the as-adjusted capitalization, set forth in the Prospectus under the
          caption "Capitalization."  To the knowledge of Company Counsel, on the
          Effective Date, there were, and on the Closing Date and any Option
          Closing Date, there will be, no options or warrants for the purchase
          of, other outstanding rights to purchase, agreements or obligations
          to issue or agreements or their other to convert or exchange any
          obligation or security into capital stock of the Company or securities
          convertible into or exchangeable for capital stock of the Company,
          except as described in the Prospectus with respect to the Employee
          Options, the Over-allotment Option, the Representatives Warrants and
          the Warrants.

               (vii)  The authorized capital stock of the Company, including
          without limitation, the outstanding Common Shares and the Shares being
          issued on the Closing Date and any Option Closing Date, conforms, in
          all material respects, with the descriptions thereof in the
          Prospectus, and such descriptions conform with the descriptions
          thereof set forth in the instruments defining the same.  The
          information in the Prospectus insofar as it relates to the Employee
          Options, the Representatives Warrants and the Warrants, in each case
          as of the Effective Date, the Closing Date and any Option Closing
          Date, is true, correct and complete, in all material respects.

               (viii)  The Common Shares outstanding immediately prior to the
          Closing Date or the Option Closing Date, as the case may be, have been
          duly authorized and are validly issued, fully paid and non-assessable.
          The Employee Options and the Warrants have been duly authorized and
          validly issued and are legal, valid and binding obligations,
          enforceable against the Company in accordance with their respective
          terms.  The Representatives Warrants, as of the Closing Date, will
          have been duly authorized and validly issued and, when executed and
          delivered by the Company, will be legal, valid and binding obligations
          enforceable against the Company in accordance with their terms.  The
          Common Shares issuable pursuant to the Employee Options, the
          Representatives Warrants and the Warrants, when issued in accordance
          with the respective terms thereof, will be duly authorized and validly
          issued, fully paid and non-assessable.  The Company has reserved a
          sufficient number of Common Shares for issuance pursuant to the
          Employee Options, the Representatives Warrants and the Warrants.  None
          of such outstanding Common Shares, the Employee Options, the
          Representatives Warrants or the Warrants were issued in violation of
          any preemptive rights of any security holder of the Company created by
          the Certificate of Incorporation or By-laws of the Company that have
          not been waived, and, to the knowledge of Company Counsel, there are
          no contractual preemptive rights that have not been waived that exist
          with respect to the outstanding Common Shares.  None of such issuable
          Common Shares will be issued in violation

                                       20

 
          of any existing preemptive rights of any security holder of the
          Company created by the Certificate of Incorporation or By-laws of the
          Company that have not been waived that exist with respect to the
          Common Shares, and, to the knowledge of Company Counsel, there are no
          contractual preemptive rights that have not been waived that exist
          with respect to the Common Shares.  The holders of the outstanding
          Common Shares are not, and will not be, subject to personal liability
          solely by reason of being such holders, and the holders of the Common
          Shares issuable pursuant to the Employee Options, the Representatives
          Warrants and the Warrants will not be subject to personal liability
          solely by reason of being such holders.  The offers and sales of the
          outstanding Common Shares, and the issuance of the Employee Options,
          the Representatives Warrants and the Warrants, were made in conformity
          with applicable registration requirements or exemptions therefrom
          under federal and applicable state securities laws.

               (ix) The issuance and sale of the Shares by the Company have been
          duly authorized and, when the Shares have been duly delivered against
          payment therefor as contemplated by this Agreement, the Shares will be
          validly issued, fully paid and nonassessable.  None of the Shares will
          be issued in violation of any preemptive rights of any stockholder of
          the Company pursuant to the Certificate of Incorporation or By-laws,
          as amended to the date hereof and the Closing Date, of the Company
          and, to the knowledge of Company Counsel, there are no contractual
          preemptive rights that have not been waived that exist with respect to
          the Shares.  The certificates representing the Shares are in proper
          legal form under, and conform in all respects to the requirements of,
          the GCL.  To the knowledge of Company Counsel, neither the filing of
          the Registration Statement nor the offering or sale of the Shares as
          contemplated by this Agreement gives any security holder of the
          Company any rights, other than those which have been waived, for or
          relating to the registration of any security of the Company.

               (x) No consent, approval, authorization, order, registration,
          license or permit of any court, government, governmental agency,
          instrumentality or other regulatory body or official is required for
          the valid authorization, issuance, sale and delivery by the Company of
          any of the Shares or for the execution, delivery or performance by the
          Company of this Agreement, except such as may be required for the
          registration of the Shares under the Act, the Regulations or the
          Exchange Act, or for compliance with the applicable state securities
          or Blue Sky laws, or by the By-laws, rules and other pronouncements of
          the NASD.  Upon the effectiveness of the Registration Statement, the
          Common Shares will be registered pursuant to Section 12(g) of the
          Exchange Act, and will be included on the AMEX.

               (xi) The Company is not in violation of, or in default under, any
          of the terms or provisions, of (A) its Certificate of Incorporation or
          By-laws, each as amended to the date hereof, the Closing Date or the
          Option Closing Date, as the case may be, (B) any indenture, mortgage,
          deed of trust, material contract, commitment or other agreement or
          instrument known to Company Counsel to which the Company is a party or
          by which it or any of its properties are bound or affected, (C) to the
          knowledge of Company Counsel, any law, rule, regulation, judgment,
          order to or decree of any government or governmental agency,
          instrumentality or court, domestic

                                       21

 
          or foreign, having jurisdiction over the Company or any of its
          properties or businesses, or (D) any license, permit, certification,
          registration, approval, consent or franchise, known to Company
          Counsel, referred to in subsections (b) or (c) of Section 1 of this
          Agreement.

               (xii)  The descriptions contained in the Registration Statement
          and Prospectus of statutes or regulations, legal and governmental
          proceedings and of contracts and other documents are accurate in all
          material respects and fairly present in all material respects the
          information required to be shown.  To the knowledge of Company
          Counsel, there are no contracts, agreements or other documents
          required to be described or referred to in the Registration Statement
          or Prospectus or to be filed as exhibits to the Registration Statement
          under the Act or the Regulations that have not been so described,
          referred to or filed as required.

               (xiii)  To the knowledge of Company Counsel, there are no claims,
          actions, suits, proceedings, arbitrations, investigations or inquiries
          pending before, or overtly threatened or contemplated by, any
          governmental agency, instrumentality, court or tribunal, domestic or
          foreign, or before any private arbitration tribunal, to which the
          Company is a party or is threatened to be made a party that can be
          reasonably expected, or, if determined adversely to the Company,
          would, in any individual case or in the aggregate, result in any
          material adverse change in the general affairs, properties, condition
          (financial or otherwise), results of operations, stockholders' equity
          or business of the Company.  To the knowledge of Company Counsel,
          there are no outstanding orders, judgments or decrees of any court,
          governmental agency, instrumentality or other tribunal enjoining the
          Company from, or requiring the Company to take or refrain from taking
          any action, or to which the Company, or any of its properties, assets
          or businesses is bound or subject.

               (xiv)  The Company owns, or possesses adequate rights to use, all
          Intellectual Property that, if not so owned or possessed, would
          materially adversely affect the general affairs, properties, condition
          (financial or otherwise), results of operations, stockholders' equity,
          businesses or prospects of the Company.

               (xv) To the knowledge of Company Counsel the Company does not own
          any real property.  All real property used or leased by the Company,
          as described in the Prospectus, is held by the Company under a valid,
          subsisting and enforceable lease.

               (xvi)  The Company is not an "investment company" or a company
          "controlled" by an "investment company," within the meaning of the
          Investment Company Act of 1940, as amended, nor, by receipt of the
          proceeds from the sale by it of the Shares pursuant to this Agreement,
          will the Company become or be deemed to be an "investment company"
          under such act.

               (xvii)  The Registration Statement has become effective under the
          Act, as of the Effective Date, and, to the Company Counsel's
          knowledge, the SEC has not issued any stop order suspending the
          effectiveness of the Registration Statement nor has the SEC instituted
          or threatened to institute proceedings with respect to any such

                                       22

 
          order.  Any and all filings required by be made by Rule 424 and Rule
          430A under the Act have been made.

               (xviii)  The Registration Statement and the Prospectus, as of the
          Effective Date, and each amendment or supplement thereto as of its
          effective or issue date (other than the financial statements and
          related schedules therein and other than the financial data and
          calculations therein based on such financial statements and schedules,
          as to which Company Counsel need not express an opinion) comply as to
          form in all material respects with the applicable requirements of the
          Act and Regulations.

               (xix)  Company Counsel has participated in the preparation of the
          Registration Statement and the Prospectus, including reviews and
          discussions of the contents thereof, and, in the course of such
          reviews and discussions, no facts came to its attention that would
          cause it to have reason to believe that (A) the Registration Statement
          or any post-effective amendment thereto, on the date it became
          effective and on the Closing Date or the Option Closing Date, as the
          case may be, contained any untrue statement of a material fact or
          omitted any material fact necessary to make the statements therein, in
          light of the circumstances under which they were made, not misleading
          or that (B) the Prospectus on the Effective Date, on the date it was
          filed pursuant to Rule 424(b) under the Act and on the Closing Date or
          Option Closing Date, as the case may be, contained any untrue
          statement of material fact or omitted any material fact necessary to
          make the statements therein, in light of the circumstances under which
          made, not misleading (except, in each case, for the financial
          statements and related schedules therein and the financial data and
          calculations therein based on such financial statements and schedules,
          as to which Company Counsel need not express an opinion).

          The foregoing opinion may be limited to the laws of the United States,
     the laws of the State of California and the GCL, and Company Counsel may
     rely as to certain legal matters on other counsel to the Company provided
     that in each case, Company Counsel shall state that they believe that they
     and the Underwriters are justified in relying on such other counsel and
     shall deliver signed copies of any such opinion to the Representatives and
     as to questions of fact upon the representations of the Company set forth
     in this Agreement and upon certificates of officers of the Company and of
     governmental officials, all of which certificates must be reasonable and
     satisfactory in form and scope to counsel for the Underwriters provided
     that in each case, Company Counsel shall deliver signed copies of any such
     certificate to the Representatives.

          (g) At the Closing Date and any Option Closing Date:  (A) the
     Registration Statement and any post-effective amendment thereto and the
     Prospectus and any amendments or supplements thereto shall contain all
     statements that are required to be stated therein in accordance with the
     Act and the Regulations and shall conform, in all material respects, to the
     requirements of the Act and the Regulations, and neither the Registration
     Statement nor any post-effective amendment thereto nor the Prospectus and
     any amendments or supplements thereto shall contain any untrue statement of
     a material fact or omit to state any material fact required to be stated
     therein or necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading, (B) since the
     respective dates

                                       23

 
     as of which information is given in the Registration Statement and any
     post-effective amendment thereto and the Prospectus and any amendments or
     supplements thereto, except as otherwise stated therein, there shall have
     been no material adverse change in the properties, condition (financial or
     otherwise), results of operations, stockholders' equity, business or
     management of the Company, from that set forth therein, whether or not
     arising in the ordinary course of business, other than as referred to in
     the Registration Statement or Prospectus, (C) since the respective dates as
     of which information is given in the Registration Statement and any post-
     effective amendment thereto and the Prospectus or any amendment or
     supplement thereto, there shall have been no transaction, contract or
     agreement entered into by the Company, other than in the ordinary course of
     business and as set forth in the Registration Statement or Prospectus that
     has not been, but would be required to be, set forth in the Registration
     Statement or Prospectus; (D) no action, suit or proceeding at law or in
     equity shall be pending or, to the knowledge of the Company, threatened
     against the Company that would be required to be set forth in Prospectus,
     other than as set forth therein, and no proceedings shall be pending or, to
     the knowledge of the Company, threatened against the Company before or by
     any federal, state or other commission, board or administrative agency
     wherein an unfavorable decision, ruling or finding would materially
     adversely affect the properties, condition (financial or otherwise),
     results of operations, stockholders' equity or business of the Company,
     other than as set forth in the Prospectus.  The Representatives shall have
     received at the Closing Date and any Option Closing Date certificates of
     each of the Chief Executive Officer and the Chief Financial Officer of the
     Company dated as of the date of the Closing Date or Option Closing Date, as
     the case may be, and addressed to the Representatives, individually and as
     the Representatives of the several Underwriters, to the effect, that the
     conditions set forth in this subsection have been satisfied and as to the
     accuracy and performance, as of the Closing Date or the Option Closing
     Date, as the case may be, of the agreements, representations and warranties
     of the Company set forth herein.

          (h) At the time this Agreement is executed and at the Closing Date and
     any Option Closing Date, the Representatives shall have received a letter
     addressed to the Representatives, individually and as the Representatives
     of the several Underwriters, and in form and substance satisfactory to the
     Representatives in all respects (including the nonmaterial nature of the
     changes or decreases, if any, referred to in clause (iii) below) from Ernst
     & Young LLP dated as of the date of this Agreement, the Closing Date or
     Option Closing Date, as the case may be:

               (i) confirming that they are independent public accountants
          within the meaning of the Act and the Regulations and stating that the
          section of the Registration Statement under the caption "Experts" is
          correct insofar as it relates to them;

               (ii) stating that, in their opinion, the financial statements of
          the Company audited by them and included in the Registration Statement
          comply in form in all material respects with the applicable accounting
          requirements of the Act and the Regulations;

               (iii)  stating that, on the basis of specified procedures, which
          included a reading of the latest available unaudited interim financial
          statements of the Company (with an indication of the date of the
          latest available unaudited interim financial statements), a reading of
          the minutes of the meetings of the stockholders and the

                                       24

 
          Board of Directors of the Company and audit and compensation
          committees of such Board, if any, and inquiries to certain officers
          and other employees of the Company who are responsible for financial
          and accounting matters and other specified procedures and inquiries,
          nothing has come to their attention that would cause them to believe
          that (A) the unaudited financial statements and related schedules of
          the Company included in the Registration Statement, if any, (I) do not
          comply in form in all material respects with the applicable accounting
          requirements of the Act and the Regulations or (II) were not fairly
          presented in conformity with generally accepted accounting principles
          on a basis substantially consistent with that of the audited financial
          statements and related schedules included in the Registration
          Statement or (B)(I) at a specified date, not more than five business
          days prior to the date of such letter there was any change in the
          capital stock or short-term or long-term debt of the Company, or any
          decrease (increase) in net current assets, total assets or
          stockholders' equity as compared with the amounts shown in the
          __________, 1995 balance sheet of the Company included in the
          Registration Statement, other than as set forth in or contemplated by
          the Registration Statement and Prospectus, and (II) during the period
          from __________, 1995 to a specified date not more than five business
          days prior to the date of such letter, there has been any decrease
          (increase), as compared with the corresponding period in the preceding
          year, in revenues, operating income or income before income taxes or
          in total or per share amounts of net income of the Company or, if
          there was any such change or decrease (increase), setting forth the
          amount of such change or decrease (increase); and

               (iv) stating that they have compared specific dollar amounts,
          numbers of shares and other information (including pro forma
          information) pertaining to the Company set forth in the Registration
          Statement and Prospectus that have been specified by the
          Representatives prior to the date of this Agreement, to the extent
          that such amounts, numbers, percentages and information may be derived
          from the general accounting or other records of the Company with the
          result obtained from the application of specified readings, inquiries
          and other appropriate procedures (which procedures do not constitute
          an audit in accordance with generally accepted auditing standards) set
          forth in the letter, and found them to be in agreement.

          (i) The Company shall have executed and delivered a Warrant Agreement
     in a form satisfactory to the Representatives (the "Warrant Agreement") and
     here shall have been tendered to the Representatives certificates
     representing all of the Representatives Warrants described in subsection
     (r) of Section 5, to be purchased by the Representatives on the Closing
     Date.

          (j) At the Closing Date and any Option Closing Date, the
     Representatives shall have been furnished such additional documents and
     certificates as they shall reasonably request.

          (k) No action shall have been taken by the NASD the effect of which is
     to make it improper, at any time prior to the Closing Date or any Option
     Closing Date, for members of the NASD to execute transactions as principal
     or as agent in the Shares or to trade or deal in the Shares, and no
     proceedings for the purpose of taking such action shall have been

                                       25

 
     instituted or shall be pending or, to the Company's or the Representatives'
     knowledge, shall be contemplated by the NASD.

     If any conditions to the Underwriters' obligations hereunder to be
fulfilled prior to or at the Closing Date or any Option Closing Date, as the
case may be, shall not have been fulfilled, the Representatives may on behalf of
the several Underwriters terminate this Agreement or, if they so elect, waive
any such conditions which have not been fulfilled or extend the time for their
fulfillment.

     8.   INDEMNIFICATION.

          (a) The Company shall indemnify and hold harmless each Underwriter,
     and each person, if any, who controls each Underwriter within the meaning
     of the Act or the Exchange Act, against any and all loss, liability, claim,
     damage and expense whatsoever, including, but not limited to, any and all
     expense whatsoever incurred in investigating, preparing or defending
     against any litigation, commenced or threatened, or any claim whatsoever or
     in connection with any investigation or inquiry of, or action or proceeding
     that may be brought against, the respective indemnified parties, arising
     out of or based upon any untrue statements or alleged untrue statements of
     a material fact contained in any Preliminary Prospectus, the Registration
     Statement or the Prospectus, or any application or other document (in this
     Section 8 collectively called "application") executed by the Company and
     based upon written information furnished by or on behalf of the Company
     filed in any jurisdiction in order to qualify all or any part of the Shares
     under the securities laws thereof or filed with the SEC or the NASD, or the
     omission or alleged omission therefrom of a material fact required to be
     stated therein or necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading; provided,
     however, that the foregoing indemnity (i) shall not apply in respect of any
     statement or omission made in reliance upon and in conformity with written
     information furnished to the Company or any Underwriter through the
     Representatives expressly for use in any Preliminary Prospectus, the
     Registration Statement or Prospectus, or any amendment or supplement
     thereof, or in any application or in any communication to the SEC, as the
     case may be, and (ii) with respect to any Preliminary Prospectus, shall not
     inure to the benefit of any Underwriter from whom the person asserting any
     such losses, claims, damages, liabilities or expenses purchase the Shares
     that are the subject thereof (or to the benefit of any person controlling
     such Underwriter) if at or prior to the written confirmation of the sale of
     such Shares a copy of an amended Preliminary Prospectus or the Prospectus
     (or the Prospectus as amended or supplemented) was not sent or delivered to
     such person and the untrue statement or omission of a material fact
     contained in such Preliminary Prospectus was corrected in the amended
     Preliminary Prospectus or Prospectus (or the Prospectus as amended or
     supplemented).  It is understood that the statements appearing in any
     Preliminary Prospectus, the Prospectus or the Registration Statement (A)
     on the inside front cover page with respect to stabilization, (B) in the
     table in the section entitled "Underwriting," and the second paragraph
     following such table with respect to the amount of the dealers' concession
     and allowance and reallowance discount and (C) in the section entitled
     "Legal Matters" with respect to the identity of counsel for the
     Underwriters constitute the only information furnished in writing by or on
     behalf of any Underwriter for inclusion in any Preliminary Prospectus, the
     Prospectus or the Registration Statement.  This indemnity agreement will be
     in addition to any liability the Company may otherwise have.

                                       26

 
          (b) Each Underwriter, severally and not jointly, shall indemnify and 
     hold harmless the Company, each of the directors of the Company, each of 
     the officers of the Company who shall have signed the Registration 
     Statement and each other person, if any, who controls the Company within 
     the meaning of the Act or the Exchange Act to the same extent as the
     foregoing indemnities from the Company to the several Underwriters, but
     only with respect to any loss, liability, claim, damage or expense
     resulting from (i) statements or omissions, or alleged statements or
     omissions, if any, made in any Preliminary Prospectus, Registration
     Statement or Prospectus or any amendment or supplement thereof or any
     application in reliance upon, and in conformity with written information
     furnished to the Company by any Underwriter through the Representatives
     with respect to any Underwriter by or on behalf of such Underwriter
     expressly for use in any Preliminary Prospectus, the Registration Statement
     or Prospectus or any amendment or supplement thereof or any application, as
     the case may be, (ii) the failure of any Underwriter at or prior to the
     written confirmation of the sale of Shares to send or deliver a copy of an
     amended Preliminary Prospectus or the Prospectus (or the Prospectus as
     amended or supplemented) to the person asserting any such losses, claims,
     damages, liabilities or expenses who purchased the Shares that are the
     subject thereof and the untrue statement or omission of a material fact
     contained in such Preliminary Prospectus was corrected in the amended
     Preliminary Prospectus or Prospectus (or the Prospectus as amended or
     supplemented) or (iii) the failure to qualify the offering or sale of the
     Shares by the several Underwriters under the state securities or Blue Sky
     laws or any jurisdiction referred to in Section 5(f) hereof which failure
     to qualify is the result of the failure to file the pertinent materials in
     any such jurisdiction. This indemnity agreement will be in addition to any
     liability such Underwriter may otherwise have.

          (c) If any action, inquiry, investigation or proceeding is brought
     against any person in respect of which indemnity may be sought pursuant to
     any of the two preceding paragraphs, such person (hereinafter called the
     "indemnified party") shall, promptly after formal notification of, or
     receipt of service of process for, such action, inquiry, investigation or
     proceeding, notify in writing the party or parties against whom
     indemnification is to be sought (hereinafter called the "indemnifying
     party") of the institution of such action, inquiry, investigation or
     proceeding and the indemnifying party, upon the request of the indemnified
     party, shall assume the defense of such action, inquiry, investigation or
     proceeding, including the employment of counsel (reasonably satisfactory to
     such indemnified party) and payment of expenses.  No indemnification
     provided for in this Section 8 shall be available to any indemnified party
     who shall fail to give such notice if the indemnifying party does not have
     knowledge of such action, inquiry, investigation or proceeding and shall
     have been materially prejudiced by the failure to give such notice, but the
     omission so to notify the indemnifying party shall not relieve the
     indemnifying party otherwise than under this Section 8.  Such indemnified
     party or controlling person shall have the right to employ its or their own
     counsel in any such case, but the fees and expenses of such counsel shall
     be at the expense of such indemnified party unless the employment of such
     counsel shall have been authorized in writing by the indemnifying party in
     connection with the defense of such action or the indemnifying party shall
     not have employed counsel to have charge of the defense of such action,
     inquiry, investigation or proceeding or such indemnified party or parties
     shall have been advised by counsel that there is a conflict of interest
     that would prevent counsel to the indemnifying party from representing both
     parties, in any of which events the reasonable fees and expenses of such
     counsel shall be borne by the indemnifying party.  It is understood that
     the indemnifying party shall not, in connection with any proceeding or
     related proceedings

                                       27

 
     in the same jurisdiction, be liable for the fees and expenses of more than
     one separate counsel (in addition to one local counsel in each jurisdiction
     in which any proceeding may be brought) for all indemnified parties.  In
     the case of any such separate counsel for the Underwriters, such firm shall
     be designated in writing by the Representative.  Expenses covered  by the
     indemnification in this subsection (c) of this Section 8 shall be paid by
     the indemnifying party as they are incurred by the indemnified party.
     Anything in this subsection to the contrary notwithstanding, the
     indemnifying party shall not be liable for any settlement of any such claim
     effected without its written consent.  The indemnifying party shall
     promptly notify the indemnified party of the commencement of any
     litigation, inquiry, investigation or proceeding against the indemnifying
     party or any of its officers or directors in connection with the issue and
     sale of any of the Shares or in connection with such Preliminary
     Prospectus, Registration Statement or Prospectus or any amendment thereto
     or supplement thereof or any such application.

          (d) If the indemnification provided for in this Section 8 is
     unavailable to or is insufficient to hold harmless an indemnified party
     under subsections (a) or (b) of this Section 8 in respect of any losses,
     liabilities, claims, damages or expenses (or actions, inquiries,
     investigations or proceedings in respect thereof) referred to therein
     except either by reason of the provisions set forth in subsections (a) or
     (b) or the failure to give notice as required in subsection (c) (provided
     that the indemnifying party does not have knowledge of the action, inquiry,
     investigation or proceeding and has been materially prejudiced by the
     failure to give such notice), then each indemnifying party shall contribute
     to the amount paid or payable by such indemnified party as a result of such
     losses, liabilities, claims, damages or expenses (or actions, inquiries,
     investigations or proceedings in respect thereof) in such proportion as is
     appropriate to reflect the relative benefits received by the Company on the
     one hand and the Underwriters on the other from the offering of the Shares.
     If, however, the allocation provided by the immediately preceding sentence
     is not permitted by applicable law, then each indemnifying party shall
     contribute to such amount paid or payable by such indemnified party in such
     proportion as is appropriate to reflect not only such relative benefits but
     also the relative fault of the Company on the one hand and the Underwriters
     on the other in connection with the statements or omissions which resulted
     in such losses, liabilities, claims or reasonable expenses (or actions,
     inquiries, investigations or proceedings in respect thereof), as well as
     any other relevant equitable considerations.  The relative benefits
     received by the Company on the one hand and the Underwriters on the other
     shall be deemed to be in the same proportion as the total net proceeds from
     the offering (before deducting expenses) received by the Company bear to
     the total underwriting discounts and commissions received by the
     Underwriters, in each case as set forth in the table on the cover page of
     the Prospectus.  The relative faults shall be determined by reference to,
     among other things, whether the untrue or alleged untrue statement of a
     material fact or the omission or alleged omission to state a material fact
     relates to information supplied by the Company on the one hand or the
     Underwriters on the other hand and the parties' relative intent, knowledge,
     access to information and opportunity to correct or prevent such statement
     or omission.

          The Company and the Underwriters agree that it would not be just and
     equitable if contributions pursuant to this section (d) of this Section 8
     were determined by pro rata allocation (even if the Underwriters were
     treated as one entity for such purpose) or by any method or allocation that
     does not take account of the equitable considerations referred to

                                       28

 
     above in this subsection (d) of this Section 8.  The amount paid or payable
     by an indemnified party as a result of the losses, liabilities, claims,
     damages or reasonable expenses (or actions, inquiries, investigations or
     proceedings in respect thereof) referred to above in this subsection (d) of
     this Section 8 shall be deemed to include any legal or other expenses
     reasonably incurred by such indemnified party in connection with
     investigating or defending any such action or claim.  Notwithstanding the
     provisions of this subsection (d) of this Section 8, (i) the provisions of
     the Agreement Among Underwriters shall govern contribution among
     Underwriters, (ii) no Underwriter (except as provided in the Agreement
     Among Underwriters) shall be required to contribute any amount in excess of
     the underwriting discounts and commissions applicable to the Shares
     purchased by such Underwriter and (iii) no person guilty of fraudulent
     misrepresentation (within the meaning of Section 11(f) of the Act) shall be
     entitled to contribution from any person who was not guilty of such
     fraudulent misrepresentation.  The Underwriters' obligation in this
     subsection (d) of this Section 8 to contribute are several in proportion to
     their respective underwriting obligations and not joint.

     9.   REPRESENTATIONS AND AGREEMENTS TO SURVIVE DELIVERY.  Except as the
context otherwise requires, all representations, warranties and agreements
contained in this Agreement shall be deemed to be representations, warranties
and agreements at the Closing Date and any Option Closing Date; and such
representations, warranties and agreements of the Underwriters and the Company,
including without limitation the indemnity and contribution agreements contained
in Section 8 hereof and the agreements contained in Sections 6, 9, 10 and 13
hereof, shall remain operative and in full force and effect regardless of any
investigation made by or on behalf of any Underwriter or any controlling person,
and shall survive delivery of the Shares and termination of this Agreement,
whether before or after the Closing Date or any Option Closing Date.

     10.  EFFECTIVE DATE OF THIS AGREEMENT AND TERMINATION THEREOF.

          (a) This Agreement shall become effective immediately as to Sections
     6, 8, 9, 10 and 13 and, as to all other provisions, (i) if at the time of
     execution and delivery of this Agreement the Registration Statement has not
     become effective, at 11:00 A.M., Philadelphia time, on the first business
     day following the Effective Date, or (ii) if at the time of execution and
     delivery of this Agreement the Registration Statement has been declared
     effective, at 11:00 A.M., Philadelphia time, on the date of execution of
     this Agreement; but this Agreement shall nevertheless become effective at
     such earlier time after the Registration Statement becomes effective as the
     Representatives may determine by notice to the Company or by release of any
     of the Shares for sale to the public.  For the purposes of this Section 10,
     the Shares shall be deemed to have been so released upon the release for
     publication of any newspaper advertisement relating to the Shares or upon
     the release by the Representatives of telegrams (i) advising the
     Underwriters that the shares are released for public offering or (ii)
     offering the Shares for sale to securities dealers, whichever may occur
     first.  The Representatives may prevent the provisions of this Agreement
     (other than those contained in Sections 6, 8, 9, 10 and 13) hereof from
     becoming effective without liability of any party to any other party,
     except as noted below, by giving the notice indicated in subsection (c) of
     this Section 10 before the time the other provisions of this Agreement
     become effective.

          (b) The Representatives shall have the right to terminate this
     Agreement at any time prior to the Closing Date as provided in Sections 7
     and 11 hereof or if any of the

                                       29

 
     following have occurred:  (i) since the respective dates as of which
     information is given in the Registration Statement and the Prospectus, any
     material adverse change or any development involving a prospective material
     adverse change in or affecting the condition, financial or otherwise, of
     the Company, or the earnings, business affairs, management or business
     prospects of the Company, whether or not arising in the ordinary course of
     business; (ii) any outbreak of hostilities or other national or
     international calamity or crisis or change in economic, political or
     financial market conditions if such outbreak, calamity, crisis or change
     would, in the Representatives' reasonable judgment, have a material adverse
     effect on the Company, the financial markets of the United States or the
     offering or delivery of the Shares; (iii) suspension of trading generally
     in securities on the New York Stock Exchange, the AMEX or the over-the-
     counter market or limitation on prices (other than limitations on hours or
     numbers of days of trading) for securities or the promulgation of any
     federal or state statute, regulation, rule or order of any court or other
     governmental authority which in the Representatives' reasonable opinion
     materially and adversely affects trading on either such Exchange or the
     over-the-counter market; (iv) the enactment, publication, decree or other
     promulgation of any federal or state statute, regulation, rule or order of
     any court or other governmental authority which in the Representatives'
     reasonable opinion materially and adversely affects or will materially and
     adversely affect the business or operations of the Company; (v) declaration
     of a banking moratorium by either federal or state authorities; (vi) the
     taking of any action by any federal, state or local government or agency in
     respect of its monetary or fiscal affairs which in the Representatives'
     reasonable opinion has a material adverse effect on the securities markets
     in the United States; (vii) declaration of a moratorium in foreign exchange
     trading by major international banks or other institutions or (viii)
     trading in any securities of the Company shall have been suspended or
     halted by the NASD or the SEC.

          (c) If the Representatives elect to prevent this Agreement from
     becoming effective or to terminate this Agreement as provided in this
     Section 10, the Representatives shall notify the Company thereof promptly
     by telephone, telex, telegraph or facsimile, confirmed by letter.

     11.  DEFAULT BY AN UNDERWRITER.

          (a) If any Underwriter or Underwriters shall default in its or their
     obligation to purchase Offered Shares or Optional Shares hereunder, and if
     the Offered Shares or Optional Shares with respect to which such default
     relates do not exceed the aggregate of 10 percent of the number of Offered
     Shares or Optional Shares, as the case may be, that all Underwriters have
     agreed to purchase hereunder, then such Offered Shares or Optional Shares
     to which the default relates shall be purchased severally by the non-
     defaulting Underwriters in proportion to their respective commitments
     hereunder.

          (b) If such default relates to more than 10 percent of the Offered
     Shares or Optional Shares, as the case may be, the Representatives may in
     its discretion arrange for another party or parties (including a non-
     defaulting Underwriter) to purchase such Offered Shares or Optional Shares
     to which such default relates, on the terms contained herein.  In the event
     that the Representatives do not arrange for the purchase of the offered
     Shares or Optional Shares to which a default relates as provided in this
     Section 11, this Agreement may be terminated by the Representatives or by
     the Company without liability on the part of the

                                       30

 
     several Underwriters (except as provided in Section 8 hereof) or the
     Company (except as provided in Sections 6 and 8 hereof), but nothing herein
     shall relieve a defaulting Underwriter of its liability, if any, to the
     other several Underwriters and to the Company for damages occasioned by its
     default hereunder.

          (c) If the Offered Shares or Optional Shares to which the default
     relates are to be purchased by the non-defaulting Underwriters, or are to
     be purchased by another party or parties as aforesaid, the Representatives
     or the Company shall have the right to postpone the Closing Date or any
     Option Closing Date, as the case may be, for a reasonable period but not in
     any event exceeding seven days, in order to effect whatever changes may
     thereby be made necessary in the Registration Statement or the Prospectus
     or in any other documents and arrangements, and the Company agrees to file
     promptly any amendment to the Registration Statement or supplement to the
     Prospectus which in the opinion of counsel for the Underwriters may thereby
     be made necessary.  The terms "Underwriters" and "Underwriter" as used in
     this Agreement shall include any party substituted under this Section 11
     with like effects as if it had originally been a party to this Agreement
     with respect to such Offered Shares or Optional Shares.

     12.  INFORMATION FURNISHED BY UNDERWRITERS.  The statements appearing in
any Preliminary Prospectus, the Prospectus or the Registration Statement (a) on
the inside front cover page with respect to stabilization, (b) in the table in
the section entitled "Underwriting," and the second paragraph following such
table with respect to the amount of the dealers' concession and allowance and
reallowance discount and (c) in the section entitled "Legal Matters" with
respect to the identity of counsel for the Underwriters constitute the only
information furnished in writing by or on behalf of any Underwriter for
inclusion in any Preliminary Prospectus, the Prospectus or the Registration
Statement referred to in subsection (b) of Section 1 hereof and subsections (a)
and (b)  of Section 8 hereof.

     13.  NOTICES.  All communications hereunder, except as herein otherwise
specifically provided, shall be in writing and, if sent to any Underwriter,
shall be mailed, delivered, telexed, telegrammed, telegraphed or telecopied and
confirmed to such Underwriter, c/o Pennsylvania Merchant Group Ltd., Suite 390,
Fidelity Court, 259 Radnor-Chester Road, Radnor, Pennsylvania 19087, Attention:
Richard A. Hansen, President, with a copy to Stradling, Yocca, Carlson & Rauth,
660 Newport Center Drive, Newport Beach, California 92660, Attention:  Nick E.
Yocca, Esquire; if sent to the Company shall be mailed, delivered, telexed,
telegrammed, telegraphed or telecopied and confirmed to Datametrics Corporation,
21135 Erwin Street, Woodland Hills, California 91367, Attention:  Sidney E.
Wing, Chief Executive Officer, with a copy to Latham & Watkins, 701 "B" Street,
Suite 2100, San Diego, California 92101, Attention:  Thomas A. Edwards, Esquire.

     14.  PARTIES.  This Agreement shall inure solely to the benefit of, and
shall be binding upon, the several Underwriters, the Company, and the
controlling persons, directors and officers referred to in Section 8 hereof, and
their respective successors, assigns, heirs and legal representatives, and no
other person shall have or be construed to have any legal or equitable right,
remedy or claim under or in respect of or by virtue of this Agreement or any
provision herein contained.  The term "successors" and "assigns" shall not
include any purchaser of the Shares merely because of such purchase.

                                       31

 
     15.  DEFINITION OF BUSINESS DAY.  For purposes of this Agreement, "business
day" means any day on which the New York Stock Exchange, Inc. is open for
trading.

     16.  COUNTERPARTS.  This Agreement may be executed in one or more
counterparts and all such counterparts will constitute one and the same
instrument.

     17.  CONSTRUCTION.  This Agreement shall be governed by and construed in
accordance with the laws of the Commonwealth of Pennsylvania applicable to
agreements made and performed entirely within such Commonwealth.

                                       32

 
     If the foregoing correctly sets forth the understanding among the
Underwriters and the Company, please so indicate in the space provided below for
that purpose, whereupon this letter shall constitute a binding agreement by and
among the Underwriters and the Company.


                                          Very truly yours,

                                          DATAMETRICS CORPORATION


                                          By: _______________________________
                                              Name:  Sidney E. Wing
                                              Title:  Chief Executive Officer


The foregoing Underwriting Agreement
is hereby confirmed and accepted as
of the date first above written.


PENNSYLVANIA MERCHANT GROUP LTD.          CRUTTENDEN ROTH INCORPORATED


By: ____________________________          By: _______________________________
    Name:                                     Name: 
    Title:                                    Title:

Acting severally on behalf of itself      Acting severally on behalf of itself
and the several Underwriters named in     and the several Underwriters named in
Schedule I hereto                         Schedule I hereto

                                       33

 
                                   SCHEDULE I

                                  UNDERWRITERS


                                                   NUMBER OF OFFERED SHARES
          UNDERWRITER                                  TO BE PURCHASED
          -----------                                  ---------------

 
                                  SCHEDULE II

                      PERSONS SUBJECT TO LOCKUP AGREEMENTS

                                        
Garland S. White

Sidney E. Wing

John J. Van Buren

Gerald A. Horwitz

Carl C. Stella

Harry P. Alteri

Roger R. DeBruno

Jim W. Foti

Ronald N. Iverson

James D. Sturgeon, Jr.

Kenneth S. Polak

Dann V. Angeloff

Richard A. Foster

Burton L. Kaplan

Richard W. Muchmore

Kenneth K. Zeiger