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                                                                     EXHIBIT 2.2

                      INDEMNIFICATION AND ESCROW AGREEMENT

     This INDEMNIFICATION AND ESCROW AGREEMENT, dated as of May 15, 2001 (the
"Escrow Agreement"), is by and among Davis Instruments, LLC, a Maryland limited
liability company ("Davis"), INOTEK Technologies Corp., a Delaware corporation
("Inotek"), and Neal E. Young, David L. White and Dennis W. Stone (collectively,
the "Indemnifying Persons"). This Escrow Agreement is entered into in connection
with the merger contemplated by the Agreement and Plan of Merger of even date
herewith (the "Merger Agreement") among Davis, Inotek and the Indemnifying
Persons. Capitalized terms used but not defined in this Escrow Agreement shall
have the meanings ascribed to such terms in the Merger Agreement.

     A. In accordance with the Merger Agreement, Davis will acquire Inotek
pursuant to a merger of a subsidiary of Davis with and into Inotek, with Inotek
as the surviving corporation.

     B. The Indemnifying Persons are holders of approximately 66% of the
outstanding voting stock of Inotek. As a condition of Davis' determination to
enter into and consummate the Merger Agreement, the Indemnifying Persons have
agreed (i) to indemnify certain parties to the extent provided in Section 2
hereof, and (ii) to secure the performance by the Indemnifying Persons of such
obligations by causing the Escrowed Amount (as defined in Section 1 hereof) to
be held back from the consideration otherwise payable to the Indemnifying
Persons at the Closing (in the amounts shown on Exhibit A attached hereto) and
to be held and distributed in accordance with this Escrow Agreement.

     NOW, THEREFORE, in consideration of the mutual covenants herein and other
valuable consideration, including the benefits to be derived by Davis and the
Indemnifying Persons as a result of the closing of the Merger, Davis, Inotek and
the Indemnifying Persons hereby agree as follows:

          1. Definitions.  The following terms shall have the following
     meanings:

          "Business Day" shall mean any day other than Saturday, Sunday, or any
     day which is a bank holiday in Texas.

          "Escrowed Amount" shall mean two hundred fifty seven thousand dollars
     ($257,000.00).

          2. Indemnification.  Subject to the terms and conditions of this
     Escrow Agreement and the Merger Agreement, from and after the Closing Date,
     the Indemnifying Persons indemnify and hold harmless Davis and its
     officers, directors, employees, agents and subsidiaries (including Inotek)
     (collectively, the "Indemnified Persons"), and the Indemnifying Persons
     shall reimburse the Indemnified Persons out of the Escrow Fund (as
     hereinafter defined) for all losses, liabilities, claims, damages, fines,
     penalties and expenses incurred after the Closing by any of the Indemnified
     Persons and arising from (i) any breach by Inotek or the Indemnifying
     Persons of the representations set forth in Section 2.04 of the Merger
     Agreement, but only to the extent that such breach is caused by Inotek's
     accounting treatment of any transaction, asset or liability other than in
     accordance with generally accepted accounting principles applicable to such
     item and the correcting entries relating to such item in Inotek's
     accounting records and related financial statements result in an adverse
     change in the reported financial condition or results of operations of
     Inotek; (ii) costs arising after the Closing in litigation relating to one
     or more breaches described in clause (i) above; (iii) costs, expenses,
     liabilities or other charges (including but not limited to attorney's fees
     and expenses) arising after the Closing directly or indirectly from the
     facts involved in the case identified by Inotek in Section 2.08 of the
     Disclosure Schedule and incurred by Inotek after the Closing in connection
     with a legal proceeding in which Inotek is a party; or (iv) costs,
     expenses, fines and penalties, if any, incurred by Inotek after the Closing
     as a result of Inotek's conducting business in one or more jurisdictions
     prior to the Closing without having taken all actions necessary to be
     qualified to do so, without having paid all required fees, taxes, and other
     charges imposed by such jurisdiction, or without obtaining all necessary
     licenses, franchises, permits or other governmental authorizations legally
     required by such jurisdiction (collectively, "Covered Costs"); provided,
     however, that, except for any liability arising from a breach of this
     Escrow Agreement, in no event shall the Indemnifying Persons' aggregate
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     liability hereunder exceed the amount of the Escrow Fund; provided further,
     that the maximum liability of each of the Indemnifying Persons hereunder
     shall be limited to such Indemnifying Person's pro rata portion of the
     Escrow Fund, as reflected on Exhibit A attached hereto; and provided
     further, that clause (iv) above shall not be applicable if, at or prior to
     the Closing, Inotek shall deliver to Davis a legal opinion, in form and
     substance reasonably satisfactory to Davis, to the effect that Inotek has,
     as of the Closing Date, the corporate power and authority to carry on its
     business in the jurisdictions in which it does business. Covered Costs
     shall include, without limitation, reasonable attorneys' fees and expenses,
     expenses of investigation and costs relating to claims against Davis,
     Inotek or any other Davis subsidiary or affiliate by any current or former
     officer, director or agent of any of such entities for indemnification or
     reimbursement or advancement of expenses, to the extent that such claims
     are described in clauses (i), (ii), (iii) or (iv) above.

          3. The Escrowed Amount; Investment.  For the purpose of securing the
     obligation of the Indemnifying Persons set forth in Section 2 hereof, the
     Escrowed Amount shall be deposited by Davis into an escrow account (the
     "Escrow Account") pursuant to Section 1.06(b)(iii) of the Merger Agreement.
     The terms governing the Escrow Account shall be mutually acceptable to Neal
     E. Young and J. P. Bolduc (who shall act as the exclusive representatives
     of the Indemnifying Persons and Davis, respectively, with respect to the
     Escrow Account). Messrs. Young and Bolduc are referred to jointly herein as
     the "Escrow Representatives." No disbursement may be made from the Escrow
     Account except pursuant to the written authorization of both of the Escrow
     Representatives or in accordance with Section 5 of this Escrow Agreement.

          During the term of this Escrow Agreement, the Escrowed Amount and all
     earnings and proceeds thereof, less any payments required to be made
     pursuant to this Escrow Agreement (such net amount as of any date being the
     "Escrow Fund" as of such date) shall be held in the Escrow Account. During
     the term of this Escrow Agreement, no portion of the Escrow Fund shall be
     deemed to be the property of either Davis or the Indemnifying Persons. The
     Escrow Fund shall be invested and reinvested in any investments approved by
     both of the Escrow Representatives.

          4. Payment for Indemnification.  (a) Should a Covered Cost be incurred
     by an Indemnified Person during the term of this Escrow Agreement, Davis
     shall deliver a notice to each of the Indemnifying Persons (a "Notice of
     Demand," with the date such Notice of Demand is delivered referred to
     herein as a "Notice Date"), executed by Davis. A Notice of Demand shall:

             (i) demand payment from the Escrow Fund, stating the amount thereof
        and the factual basis for the demand, in reasonable detail; and

             (ii) certify that Davis has delivered a copy of the Notice of
        Demand to each Indemnifying Person.

          (b) Except as otherwise provided in Section 5, the Escrow
     Representatives shall transfer the amount demanded (the "Escrow Payment")
     from the Escrow Fund to an account designated by Davis, on behalf of and in
     satisfaction of the rights of the Indemnified Persons, by 10:00 a.m.
     Central time on the date fifteen (15) Business Days after the applicable
     Notice Date (the "Payment Date").

          5. Objection.  (a) If, after a Notice of Demand pursuant to Section 4
     has been delivered to each of the Indemnifying Persons and prior to the
     applicable Payment Date, Neal E. Young (who is hereby empowered to act
     exclusively on behalf of the Indemnifying Persons with respect to this
     Escrow Agreement) shall deliver a notice to Davis conforming to the
     requirements of this Section 5 to the effect that the Indemnifying Persons
     object to payment of all or part of such Escrow Payment (an "Objection
     Notice,"), the Escrow Representatives shall cause to be paid to Davis out
     of the Escrow Account only the undisputed portion of such Escrow Payment on
     the Payment Date and shall not pay the disputed portion (the "Disputed
     Amount"), except as otherwise provided in this Section 5. Each Objection
     Notice shall be executed by Neal E. Young and shall state the amount of the
     demanded Escrow Payment which is disputed and the factual basis for such
     dispute, in reasonable detail.

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          (b) If Davis has received an Objection Notice prior to the applicable
     Payment Date, the Disputed Amount shall not be paid out of the Escrow
     Account to Davis unless (i) the Escrow Representatives shall have both
     executed a certificate (a "Joint Instruction"), or (ii) an Arbitration
     Order (as defined below) shall have been entered determining that all or a
     portion of the Disputed Amount is a Covered Cost (each, a "Dispute
     Resolution Notice"). Upon execution by the Escrow Representatives of a
     Joint Instruction or the entry of an Arbitration Order, the Escrow
     Representatives shall promptly cause to be paid to Davis out of the Escrow
     Fund, on behalf of and in satisfaction of the rights of the Indemnified
     Persons, the lesser of (i) the Disputed Amount or, if applicable, that
     portion of the Disputed Amount determined to be a Covered Cost in such
     Dispute Resolution Notice, plus simple interest thereon from the Notice
     Date until the date of such payment at the variable rate of interest per
     annum published in the Wall Street Journal (identified therein as the
     "Prime Rate") and defined therein as "the base rate on corporate loans
     posted by at least 75% of the nation's 30 largest banks," or any successor
     to such rate published by the Wall Street Journal, plus any fees, costs and
     expenses payable to Davis pursuant to Section 6 hereof, or (ii) the amount
     then remaining in the Escrow Fund.

          6. Arbitration.  In the event an Objection Notice shall have been
     delivered to Davis prior to payment of an Escrow Payment and a Joint
     Instruction shall not have been executed within 15 Business Days after the
     date on which the Objection Notice shall have been delivered to Davis, then
     either (i) once the Disputed Amount exceeds $25,000.00, or, (ii) if the
     Disputed Amount does not exceed $25,000.00 prior to the first anniversary
     of the Effective Time, then on such anniversary or as soon thereafter as
     practicable, Davis and the Indemnifying Persons shall submit the subject
     dispute to arbitration in accordance with applicable rules and procedures
     of the American Arbitration Association then in effect. No such arbitration
     shall require Davis or the Indemnifying Persons to provide any deposit or
     indemnity bond. The arbitration shall be conducted in Dallas, Texas. Each
     party agrees to use its commercially reasonable best efforts to achieve a
     resolution of such proceedings as promptly as practicable.

          The prevailing party or parties in such a proceeding shall be entitled
     to recover from the opposing party or parties attorneys' fees, witness
     costs and expenses and other costs and expenses reasonably incurred by such
     party in connection with such proceeding. The parties agree that their
     agreement to arbitrate, any judgment rendered with respect to an
     arbitration award and the obligations of the Escrow Representatives set
     forth in this Escrow Agreement shall be specifically enforceable. Upon a
     final determination in an arbitration proceeding hereunder, the arbitration
     panel shall notify Davis and the Indemnifying Persons thereof (such notice
     being the "Arbitration Order"). Jurisdiction of such arbitration panel
     shall be exclusive as to disputes between Davis and any of the Indemnifying
     Persons with respect to the Escrow Fund, and an Arbitration Order shall be
     final and binding upon Davis and all of the Indemnifying Persons. Neither
     Davis nor any of the Indemnifying Persons shall have the right to appeal
     any determination by an arbitration panel or otherwise to submit a dispute
     or controversy regarding the Escrow Fund to a court of law or any other
     forum, except that each party shall have the right to institute a civil
     action for damages and/or equitable relief based solely upon a failure by
     any of the parties to comply with the terms of this Escrow Agreement.

          7. Final Release of Funds.  The balance in the Escrow Fund, if any,
     shall be distributed in the percentages shown on Exhibit A to such accounts
     as Neal E. Young may designate in writing, upon the earlier to occur of the
     following:

             (i) the time at which Davis provides a written notice to Neal E.
        Young to the effect that, in the exercise of reasonable business
        judgment, Davis is satisfied that no further costs, charges or other
        expenses are likely to be asserted for which the Escrow Fund may be
        charged pursuant to this Escrow Agreement; or

             (ii) twelve months after the Effective Time; provided, however,
        that if at the expiration of such period a Notice of Demand has been
        made by Davis which remains unpaid and with respect to which a final
        resolution has not been made (an "Unsettled Amount"), then the Unsettled
        Amount shall be held in the Escrow Account until the Notice of Demand
        has been resolved. Any Unsettled

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        Amount, together with any interest thereon as provided in Section 5(b)
        hereof, shall be released to the appropriate party as soon as
        practicable following a final resolution in accordance with this Escrow
        Agreement.

          8. Maintenance of Escrow Fund.  The Escrow Representatives shall not
     permit the removal of any amount from the Escrow Account, except as
     permitted under this Escrow Agreement.

          9. Cost of Maintaining Escrow Account.  Davis shall pay all account
     maintenance fees and other charges payable in connection with the
     establishment and maintenance of the Escrow Account.

          10. Termination.  This Escrow Agreement shall terminate on the
     delivery of all of the assets in the Escrow Account to Davis and/or the
     Indemnifying Persons in accordance with the terms hereof.

          11. Waiver and Amendments.  No provision of this Escrow Agreement
     shall be deemed waived, amended, or modified except by the written
     agreement of all of the parties hereto.

          12. Notices.  Any notice or other communication in connection herewith
     shall be in writing and, addition to any other method of delivery utilized
     by the party giving the notice, such party shall transmit a copy thereof by
     facsimile to each of the other parties for whom a facsimile number is
     listed below. If a copy is so transmitted, it shall be deemed to have been
     delivered or made on the date of delivery, in the case of hand delivery, or
     three (3) business days after deposit in the United States Registered Mail,
     postage prepaid, or upon receipt if transmitted by facsimile or any other
     means, addressed (in any case) as follows:

             (a) if to Davis:

               Davis Instruments, LLC
               4701 Mount Hope Drive
               Baltimore, Maryland 21215
               Attention: Mr. Lee D. Rudow, President
               Facsimile: (410) 764-8237

             with a copy to:

               John S. Daniels
               Attorney at Law
               6440 North Central Expressway, Suite 503
               Dallas, Texas 75206
               Facsimile: (214) 368-9094

             (a) if to Inotek:

               INOTEK Technologies Corp.
               11212 Indian Trail
               Dallas, Texas 75229
               Attention: Neal E. Young
               Facsimile: (972) 210-1601

             with a copy to:

               Bruce A. Cheatham, Esq.
               Winstead, Sechrest & Minick P.C.
               5400 Renaissance Tower
               1201 Elm Street
               Dallas, Texas 75270
               Facsimile: (214) 745-5867

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             (c) if to the Indemnifying Persons:

               Mr. Neal E. Young
               4 Brigade Ct.
               Dallas, Texas 75225
               Facsimile: (214) 210-1601

               Mr. David L. White
               4205 Lakeside Drive
               Dallas, Texas 75219
               Facsimile: (214) 521-4293

               Mr. Dennis W. Stone
               5908 Lennox Hill
               Plano, Texas 75093

     or to such other address as any party may from time to time designate by
written notice to the others.

          13. Governing Law.  This Agreement shall be governed by the laws of
     the State of Texas.

          14. Severability.  If any provision of this Escrow Agreement shall,
     for any reason, be adjudicated by any body of competent jurisdiction to be
     invalid or unenforceable, such judgment shall not affect, impair or
     invalidate the remainder of this Escrow Agreement but shall be confined in
     its operation to the provision of this Escrow Agreement directly involved
     in the controversy in which such judgment shall have been rendered.

          15. Counterparts.  This Escrow Agreement may be executed in multiple
     counterparts, each of which shall be deemed an original and all of which
     shall be deemed one and the same instrument.

          16. Successors and Assigns.  This Agreement shall be binding upon and
     inure to the benefit of the parties hereto and their respective successors
     and assigns. Except for the Indemnified Persons who are not parties to this
     Escrow Agreement, there shall be no third party beneficiaries hereof.

          IN WITNESS WHEREOF, this Escrow Agreement is duly executed by the
     undersigned as of the date first above written.

                                            DAVIS INSTRUMENTS, LLC

                                            By:  /s/ LEE D. RUDOW
                                              ----------------------------------
                                            Its:  President
                                              ----------------------------------

                                            INOTEK TECHNOLOGIES CORP.

                                            By:  /s/ NEAL E. YOUNG
                                              ----------------------------------
                                            Its:  Chairman
                                              ----------------------------------

                                                    /s/ NEAL E. YOUNG
                                            ------------------------------------
                                                       Neal E. Young

                                                   /s/ DAVID L. WHITE
                                            ------------------------------------
                                                       David L. White

                                                   /s/ DENNIS W. STONE
                                            ------------------------------------
                                                      Dennis W. Stone

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                                                                       EXHIBIT A



INDEMNIFYING PERSON   AMOUNT CONTRIBUTED   PERCENTAGE OF ESCROW FUND
- -------------------   ------------------   -------------------------
                                     
  Neal E. Young         $111,459                     43.4%
 David L. White         $136,265                     53.0%
 Dennis W. Stone         $9,276                       3.6%


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