EXHIBIT 10.25

                  WARRANT  AGREEMENT  dated as of  _________  ___,  1997 between
Nexar  Technologies,  Inc., a Delaware  corporation (the  "Company"),  and Sands
Brothers & Co., Ltd. (hereinafter referred to as the "Representative").

                              W I T N E S S E T H:

                  WHEREAS,  the Company proposes to issue to the Representative,
in its individual capacity and not as representative of the several Underwriters
(defined below) warrants  ("Warrants") to purchase up to an aggregate of 250,000
shares  (the  "Shares")  of common  stock of the  Company,  $0.01 par value (the
"Common Stock"); and

                  WHEREAS,  the  Representative  has  agreed,  pursuant  to  the
underwriting agreement (the "Underwriting  Agreement") dated _________ ___, 1997
between the Representative,  as representative of the several Underwriters named
in  Schedule  A to the  Underwriting  Agreement  (the  "Underwriters")  and  the
Company,  to act as one of the  underwriters  in  connection  with the Company's
proposed public offering (the "Public  Offering") of 2,500,000  shares of Common
Stock at an initial  public  offering price of $_____ per share of Common Stock;
and

                  WHEREAS,  the Warrants  issued  pursuant to this Agreement






are being issued by the Company to the  Representative  or bona fide officers or
shareholders of the  Representative,  in  consideration  for, and as part of the
Representative's  compensation in connection with, the Representative  acting as
one of the underwriters pursuant to the Underwriting Agreement;

                  NOW, THEREFORE,  in consideration of the premises, the payment
by the  Representative  to the Company of ONE  HUNDRED  DOLLARS  ($100.00),  the
agreements  herein  set forth and other  good and  valuable  consideration,  the
receipt and  sufficiency  of which are hereby  acknowledged,  the parties hereto
agree as follows:

1.       Grant.

                  The  Representative,  and/or its designees who are officers or
shareholders of the  Representative in connection with the Public Offering,  are
hereby  granted  the right to  purchase,  at any time from  __________  __, 1998
[FIRST  ANNIVERSARY  OF EFFECTIVE  DATE] until 5:00 P.M., New York City time, on
_______ __, 2002 [FIFTH  ANNIVERSARY OF EFFECTIVE  DATE] (the "Warrant  Exercise
Term"), up to 250,000 Shares at an initial exercise price (subject to adjustment
as provided in Article 8 hereof) of $_____ per Share.



                                      -2-


                  2.       Warrant Certificates.

                  The  warrant   certificates   (the   "Warrant   Certificates")
delivered and to be delivered  pursuant to this  Agreement  shall be in the form
set forth as  Exhibit  A,  attached  hereto  and made a part  hereof,  with such
appropriate  insertions,  omissions,   substitutions  and  other  variations  as
required or permitted by this Agreement.

                  3.       Exercise of Warrants.

                           3.1      Cash Exercise.   The  Warrants initially are
exercisable  at a price of $_____  per Share  purchased,  payable  in cash or by
check to the order of the Company, or any combination of cash or check,  subject
to  adjustment  as provided in Article 8 hereof.  Upon  surrender of the Warrant
Certificate  with the  annexed  Form of  Election  to  Purchase  duly  executed,
together  with payment of the Exercise  Price (as  hereinafter  defined) for the
Shares  purchased,  at the  principal  office of the  Company  in  Massachusetts
(presently located at 182 Turnpike Road, Westborough, MA 01581) or at the office
of its transfer agent, the registered holder of a Warrant Certificate  ("Holder"
or "Holders") shall be entitled to receive a certificate or certificates for the
Shares so purchased. The purchase rights represented by each Warrant Certificate
are exercisable at the option of the Holder



                                      -3-


hereof,  in whole or in part (but not as to fractional  Shares).  In the case of
the  purchase  of less  than  all  the  Shares  purchasable  under  any  Warrant
Certificate,  the  Company  shall  cancel  said  Warrant  Certificate  upon  the
surrender  thereof and shall  execute and deliver a new Warrant  Certificate  of
like tenor for the balance of the Shares purchasable thereunder.

                           3.2      Cashless Exercise.    At any time during the
Warrant Exercise Term, the Holder may, at its option,  exchange this Warrant, in
whole or in part (a "Warrant Exchange"), into the number of Shares determined in
accordance with this Section 3.2, by surrendering  this Warrant at the principal
office of the Company or at the office of its transfer  agent,  accompanied by a
notice  stating  such  Holder's  intent to effect such  exchange,  the number of
Shares to be  exchanged  and the date on which  the  Holder  requests  that such
Warrant  Exchange occur (the "Notice of Exchange").  The Warrant  Exchange shall
take place on the date  specified  in the Notice of Exchange  or, if later,  the
date the Notice of Exchange is received by the Company  (the  "Exchange  Date").
Certificates  for the  Shares  issuable  upon  such  Warrant  Exchange  and,  if
applicable,  a new  warrant of like tenor  evidencing  the balance of the Shares
remaining subject to this Warrant, shall be issued as of the



                                      -4-


Exchange Date and  delivered to the Holder  within three (3) days  following the
Exchange  Date.  In  connection  with any Warrant  Exchange,  this Warrant shall
represent the right to subscribe  for and acquire the number of Shares  (rounded
to the next highest  integer) equal to (i) the number of Shares specified by the
Holder in its Notice of Exchange  (the "Total  Number")  less (ii) the number of
Shares equal to the  quotient  obtained by dividing (A) the product of the Total
Number and the  existing  Exercise  Price (as  hereinafter  defined)  by (B) the
current  market value of a Public  Share.  Notwithstanding  the  foregoing,  the
exercising  Holder must pay the nominal value of each share of Common Stock that
is issued by the Company pursuant to any such exercise.

                  4.       Issuance of Certificates.

                  Upon  the   exercise  of  the   Warrants,   the   issuance  of
certificates  for the Shares purchased shall be made forthwith (and in any event
within three  business days  thereafter)  without  charge to the Holder  thereof
including,  without  limitation,  any tax which may be payable in respect of the
issuance  thereof,  and such  certificates  shall  (subject to the provisions of
Article 5 hereof) be issued in the name of, or in such names as may be  directed
by, the Holder thereof; provided, however, that the Company shall not


                                       -5-



be  required  to pay any tax which may be payable  in  respect  of any  transfer
involved in the issuance and delivery of any such certi  ficates in a name other
than  that of the  Holder  and the  Company  shall not be  required  to issue or
deliver such certificates  unless or until the person or persons  requesting the
issuance  thereof shall have paid to the Company the amount of such tax or shall
have established to the satisfaction of the Company that such tax has been paid.

                  The Warrant  Certificates and the  certificates  repre senting
the Shares shall be executed on behalf of the Company by the manual or facsimile
signature of the present or any future Chairman or Vice Chairman of the Board of
Directors or President or Vice President of the Company under its corporate seal
reproduced  thereon,  attested to by the manual or  facsimile  signature  of the
present or any future Secretary or Assistant  Secretary of the Company.  Warrant
Certificates  shall be dated the date of  execution  by the Company upon initial
issuance, division, exchange, substitution or transfer.

                  Upon  exercise,   in  part  or  in  whole,  of  the  Warrants,
certificates  representing the Shares shall bear a legend substantially  similar
to the following:



                                      -6-


         "The  securities   represented  by  this   certificate  and  the  other
         securities  issuable  upon  exercise  thereof have not been  registered
         under the Securities  Act of 1933, as amended (the "Act"),  and may not
         be offered or sold  except (i)  pursuant to an  effective  registration
         statement  under the Act,  (ii) to the extent  applicable,  pursuant to
         Rule 144 under the Act (or any similar  rule under such Act relating to
         the  disposition  of  securities),  or (iii) upon the  delivery  by the
         holder to the Company of an opinion of counsel, reasonably satisfactory
         to counsel to the Company,  stating that an exemption from registration
         under such Act is available."

                  5.       Restriction on Transfer of Warrants.

                  The  Holder  of  a  Warrant  Certificate,  by  its  acceptance
thereof,  covenants  and  agrees  that the  Warrants  are being  acquired  as an
investment  and not  with a view  to the  distribution  thereof,  and  that  the
Warrants  may not be sold,  transferred,  assigned,  hypothecated  or  otherwise
disposed  of,  in whole or in part,  for a period  of one (1) year from the date
hereof, except to officers or shareholders of the Representative.

                  6.       Price.

                           6.1      Initial and Adjusted Exercise Price.  The
initial  exercise  price of each  Warrant  shall be $ per  Share.  The  adjusted
exercise  price shall be the price which shall result from time to time from any
and all  adjustments  of the  initial



                                      -7-


exercise price in accordance with the provisions of Article 8 hereof.

                           6.2      Exercise Price.   The term  "Exercise Price"
herein shall mean the initial  exercise  price or the adjusted  exercise  price,
depending upon the context.

                  7.       Registration Rights.

                           7.1      Registration  Under  the  Securities  Act of
1933.  The  Warrants  and the Shares have not been  registered  for  purposes of
public distribution under the Securities Act of 1933, as amended (the "Act").

                           7.2      Registrable Securities.   As used herein the
term  "Registrable  Security"  means each of the Shares and any shares of Common
Stock  issued upon any stock split or stock  dividend in respect of such Shares;
provided,  however,  that with respect to any particular  Registrable  Security,
such security  shall cease to be a Registrable  Security when, as of the date of
determination, (i) it has been effectively registered under the Act and disposed
of pursuant thereto,  (ii) registration  under the Act is no longer required for
subsequent  public  distribution  of such  security or (iii) it has ceased to be
outstanding.  The term  "Registrable  Securities"  means any  and/or  all of the
securities



                                      -8-


falling  within the  foregoing  definition of a  "Registrable  Security." In the
event of any merger,  reorganization,  consolidation,  recapitalization or other
change in corporate  structure affecting the Common Stock, such adjustment shall
be made in the definition of  "Registrable  Security" as is appropriate in order
to prevent any dilution or enlargement  of the rights  granted  pursuant to this
Article 7.

                           7.3      Piggyback Registration.   If,  at  any  time
during the five years following the date of this Agreement, the Company proposes
to prepare and file any new registration statement or post-effective  amendments
thereto  covering  equity  or  debt  securities  of the  Company,  or  any  such
securities of the Company held by its shareholders (in any such case, other than
in connection  with a merger,  acquisition  or pursuant to Form S-8 or successor
form),  (for  purposes  of  this  Article  7,   collectively,   a  "Registration
Statement"), it will give written notice of its intention to do so by registered
mail ("Notice"),  at least thirty (30) business days prior to the filing of each
such Registration Statement, to all holders of the Registrable Securities.  Upon
the written request of



                                      -9-


such a holder (a  "Requesting  Holder"),  made within fifteen (15) business days
after  receipt of the  Notice,  that the Company  include any of the  Requesting
Holder's  Registrable  Securities in the proposed  Registration  Statement,  the
Company shall, as to each such Requesting Holder, use its best efforts to effect
the registration  under the Act of the Registrable  Securities which it has been
so requested to register ("Piggyback Registration"),  at the Company's sole cost
and expense and at no cost or expense to the Requesting  Holders;  provided that
the  Requesting  Holders  shall  bear  all  selling  commissions  and  fees  and
disbursements of counsel, if any, for the Requesting Holders.

                           7.4      Demand Registration.

                                    (a)      At  any  time  during  the  Warrant
Exercise Term, any "Majority  Holder" (as such term is defined in Section 7.4(c)
below) of the  Registrable  Securities  shall have the right  (which right is in
addition to the  piggyback  registration  rights  provided for under Section 7.3
hereof),  exercisable by written notice to the Company (the "Demand Registration
Request"), to have the Company prepare and file with the Securities and Exchange
Commission  (the  "Commission"),  on one  occasion,  at the sole  expense of the
Company,  a  Registration  Statement  and  such  other  documents,



                                      -10-


including a prospectus,  as may be necessary (in the opinion of both counsel for
the Company and counsel for such Majority  Holder),  in order to comply with the
provisions  of the  Act,  so as to  permit  a  public  offering  and sale of the
Registrable  Securities  by the holders  thereof,  for twelve  (12)  consecutive
months.

                                    (b)     The  Company covenants and agrees to
give  written  notice of any Demand  Registration  Request to all holders of the
Registrable  Securities  within  ten (10)  days  from the date of the  Company's
receipt of any such Demand Registration Request. After receiving notice from the
Company as provided in this Section  7.4(b),  holders of Registrable  Securities
may  request  the  Company  to  include  their  Registrable  Securities  in  the
Registration  Statement  to be  filed  pursuant  to  Section  7.4(a)  hereof  by
notifying the Company of their  decision to include such  securities  within ten
(10) days of their receipt of the Company's notice.

                                    (c)     The term  "Majority Holder"  as used
in this  Section  7.4 shall  mean any  holder or any  combination  of holders of
Registrable Securities,  if included in such holders' Registrable Securities are
that  aggregate  number of Shares  (including  Shares  already issued and Shares
issuable pursuant to the exercise of outstanding Warrants) as would constitute a
majority of the



                                      -11-


aggregate number of Shares  (including Shares already issued and Shares issuable
pursuant  to  the  exercise  of  outstanding  Warrants)  included  in all of the
Registrable Securities.

                           7.5      Covenants  of  the  Company  With Respect to
Registration.   The Company covenants and agrees as follows:

                                    (a)     In  connection with any registration
under Section 7.4 hereof,  the Company shall file the Registration  Statement as
expeditiously as possible, but in no event later than thirty (30) days following
receipt  of any  demand  therefor,  shall use its best  efforts to have any such
Registration  Statements  declared  effective at the earliest possible time, and
shall furnish each holder of Registrable  Securities such number of prospectuses
as shall reasonably be requested.

                                    (b)     The  Company  shall  pay  all costs,
fees and expenses in connection with all Registration  Statements filed pursuant
to Sections 7.3 and 7.4(a) hereof including,  without limitation,  the Company's
legal and accounting fees,  printing expenses,  and reasonable blue sky fees and
expenses.

                                    (c)     The  Company will take all necessary
action  which may be required  in  qualifying  or  registering  the  Registrable
Securities included in a Registration  Statement for offering and



                                      -12-


sale  under the  securities  or blue sky laws of such  states as are  reasonably
requested by the holders of such securities, provided that the Company shall not
be obligated to execute or file any general  consent to service of process or to
qualify  as a  foreign  corporation  to do  business  under the laws of any such
jurisdiction.

                                    (d)     The  Company  shall  indemnify   any
holder of the  Registrable  Securities to be sold  pursuant to any  Registration
Statement and any  underwriter or person deemed to be an  underwriter  under the
Act and each person,  if any, who controls such holder or  underwriter or person
deemed to be an  underwriter  within  the  meaning  of  Section 15 of the Act or
Section  20(a) of the  Securities  Exchange Act of 1934,  as amended  ("Exchange
Act"),  against all loss,  claim,  damage,  expense or liability  (including all
expenses  reasonably  incurred in investigating,  preparing or defending against
any claim whatsoever) to which any of them may become subject under the Act, the
Exchange Act or otherwise,  arising from such registration statement to the same
extent and with the same effect as the provisions  pursuant to which the Company
has  agreed  to  indemnify  the  Underwriters  contained  in  Section  7 of  the
Underwriting Agreement and to provide for just and equitable contribution as set
forth in Section 8 of the Underwriting



                                      -13-


Agreement.

                                    (e)     Nothing  contained in this Agreement
shall be construed as requiring any Holder to exercise his Warrants prior to the
initial filing of any Registration Statement or the



                                      -14-


effectiveness thereof.

                                    (f)     If  the Company shall fail to comply
with the  provisions  of this Article 7, the Company  shall,  in addition to any
other  equitable  or  other  relief  available  to the  holders  of  Registrable
Securities,  be liable  for any or all  incidental,  special  and  consequential
damages  sustained  by  the  holders  of  Registrable   Securities,   requesting
registration of their Registrable Securities.

                                    (g)     Except  as  set  forth  in   Section
7.5(i)  hereof,  the Company  shall not permit the  inclusion of any  securities
other  than  the  Registrable  Securities  to be  included  in any  Registration
Statement filed pursuant to Section 7.4 hereof, or permit any other registration
statement to be or remain effective  during the  effectiveness of a Registration
Statement  filed  pursuant  to Section 7.4  hereof,  without  the prior  written
consent  of the  Majority  Holders,  which  consent  shall  not be  unreasonably
withheld.

                                    (h)     The  Company  shall deliver promptly
to each holder of Registrable Securities  participating in the offering in which
such  Holder's  shares are being  registered  pursuant to Section 7.3 hereof and
requesting the correspondence and memoranda described in this Section 7.5(h) and
to the managing  underwriter,


                                      -15-


if any, copies of all correspondence between the Commission and the Company, its
counsel  or  auditors  and  all  memoranda  relating  to  discussions  with  the
Commission  or its staff with respect to the  Registration  Statement and permit
each holder of Registrable Securities and underwriters to do such investigation,
upon  reasonable  advance  notice,  with respect to information  contained in or
omitted  from the  Registration  Statement as it deems  reasonably  necessary to
comply with applicable  securities laws or rules of the National  Association of
Securities  Dealers,  Inc. Such  investigation  shall  include  access to books,
records and properties and  opportunities to discuss the business of the Company
with its officers and independent auditors, all to such reasonable extent and at
such reasonable times and as often as any such holder of Registrable  Securities
or underwriter shall reasonably request.

                                    (i)     Upon the written request therefor by
any  holders  of  Registrable  Securities,  the  Company  shall  include  in the
Registration  Statement  covering any of the  Registrable  Securities  any other
securities of the Company held by such holders of  Registrable  Securities as of
the  date  of  filing  of  such  Registration  Statement,   including,   without
limitation,  restricted shares of Common Stock,  options,  warrants or any other
securities


                                      -16-



convertible into shares of Common Stock.

                  7.6      Covenants  of  the Requesting Holders With Respect to
Registration.  In connection with such Registration Statement, the
following shall be applicable:

                  (a) Any holder of  Registrable  Securities to be sold pursuant
to a Registration  Statement,  and its successors and assigns,  shall severally,
and not jointly,  indemnify,  the Company,  its officers and  directors and each
person, if any, who controls the Company within the meaning of Section 15 of the
Act or Section 20(a) of the Exchange  Act,  against all loss,  claim,  damage or
expense  or   liability   (including   all  expenses   reasonably   incurred  in
investigating,  preparing or defending  against any claim  whatsoever)  to which
they may become  subject under the Act, the Exchange Act or  otherwise,  arising
from  information  furnished in writing by or on behalf of such  holder,  or its
successors or assigns, for specific inclusion in such Registration  Statement to
the same extent and with the same effect as the provisions  contained in Section
7 of the Underwriting  Agreement  pursuant to which the Underwriters have agreed
to indemnify the Company and to provide for just and equitable  contribution  as
set forth in Section 8 of the Underwriting Agreement.



                                      -17-


                  (b) In connection with such Registration Statement, each
Holder will:

                      (i) furnish to the Company such information regarding such
Holder,  the  Registrable  Securities  and any other  securities  of the Company
beneficially  held by such  Holder as the  Company  may  reasonably  request  in
writing  and  as  shall  be  required  in  connection  with  any   registration,
qualification or compliance referred to in this Agreement; and

                      (ii) if, after a Registration Statement becomes effective,
the  Company  advises  the holders of  Registrable  Securities  that the Company
considers it  appropriate  for the  Registration  Statement  to be amended,  the
Holders of such shares  shall  suspend any  further  sales of their  Registrable
Securities  until the Company advises them that the  Registration  Statement has
been amended.

                   8.      Adjustments of Exercise Price and Number of Shares.

The  following  adjustments  apply to the Exercise  Price of the  Warrants  with
respect to the Shares and the number of Shares  purchasable upon exercise of the
Warrants.

                           8.1  Computation  of  Adjusted  Price.  In  case  the
Company  shall at any time after the date hereof pay a dividend in



                                      -18-


Common Stock or make a distribution in Common Stock,  then upon such dividend or
distribution the Exercise Price in effect  immediately prior to such dividend or
distribution shall forthwith be reduced to a price determined by dividing:

                                            (a) an  amount  equal  to the  total
number of shares of Common Stock outstanding  immediately prior to such dividend
or distribution  multiplied by the Exercise Price in effect immediately prior to
such dividend or distribution, by

                                            (b) the  total  number  of shares of
Common Stock outstanding immediately after such issuance or sale.

                                    For the  purposes of any  computation  to be
made in  accordance  with the  provisions  of this Section 8.1, the Common Stock
issuable by way of dividend  or other  distribution  on any stock of the Company
shall be deemed to have been issued immediately after the opening of business on
the date following the date fixed for the determination of stockholders entitled
to receive such dividend or other distribution.

                           8.2      Subdivision and Combination.   In  case  the
Company shall at any time subdivide or combine the outstanding  shares of Common
Stock,  the Exercise Price shall forthwith be  proportionately  decreased in the
case of subdivision or increased



                                      -19-


in the case of combination.

                           8.3      Adjustment in Number of Shares.    Upon each
adjustment of the Exercise  Price  pursuant to the provisions of this Article 8,
the  number  of Shares  issuable  upon the  exercise  of each  Warrant  shall be
adjusted to the nearest full Share by multiplying a number equal to the Exercise
Price in effect  immediately  prior to such  adjustment  by the number of Shares
issuable upon exercise of the Warrants  immediately prior to such adjustment and
dividing the product so obtained by the adjusted Exercise Price.

                           8.4     Reclassification, Consolidation, Merger, etc.
In case of any  reclassification  or change of the outstanding  shares of Common
Stock (other than a change in par value to no par value, or from no par value to
par value,  or as a result of a subdivision or  combination),  or in the case of
any  consolidation  of the Company with, or merger of the Company into,  another
corporation  (other than a  consolidation  or merger in which the Company is the
surviving  corporation  and which  does not  result in any  reclassification  or
change of the outstanding shares of Common Stock, except a change as a result of
a  subdivision  or  combination  of such  shares  or a change in par  value,  as
aforesaid), or in the case of a sale or conveyance to another corporation of the
property


                                      -20-


of the Company as an entirety,  the Holders shall  thereafter  have the right to
purchase  the kind and  number  of shares  of stock  and  other  securities  and
property receivable upon such reclassification,  change, consolidation,  merger,
sale or  conveyance  as if the  Holders  were  the  owners  of both  the  Shares
immediately  prior to any such events at a price equal to the product of (x) the
number of shares of Common Stock issuable upon exercise of the Holders' Warrants
(y) the Exercise Price in effect  immediately  prior to the record date for such
reclassification,  change, consolidation,  merger, sale or conveyance as if such
Holders had exercised the Warrants.

                           8.5 Intentionally Omitted.    The number of shares of
Common Stock at any one time  outstanding  shall include the aggregate number of
shares  issued or issuable  upon the exercise of options,  rights,  warrants and
upon the conversion or exchange of convertible or exchangeable securities.

                           8.6       Dividends   and  Other  Distributions  with
Respect to  Outstanding  Securities.  In the event that the Company shall at any
time prior to the  exercise  of all  Warrants  declare a dividend  (other than a
dividend  consisting  solely of shares of  Common  Stock


                                      -21-


or a cash dividend or distribution) or otherwise  distribute to its shareholders
any monies,  assets,  property,  rights,  evidences of indebtedness,  securities
(other than shares of Common Stock), whether issued by the Company or by another
person or  entity,  or any other  thing of value,  the  Holder or Holders of the
unexercised Warrants shall thereafter be entitled,  in addition to the shares of
Common  Stock or other  securities  receivable  upon the  exercise  thereof,  to
receive, upon the exercise of such Warrants, the same monies, property,  assets,
rights,  evidences of indebtedness,  securities or any other thing of value that
they  would  have been  entitled  to  receive  at the time of such  dividend  or
distribution.  At the time of any such  dividend  or  distribution,  the Company
shall  make  appropriate  reserves  to  ensure  the  timely  performance  of the
provisions of this Subsection 8.6.

                           8.7      Subscription  Rights  for  Shares  of Common
Stock  or Other  Securities.  In the case the  Company  or an  affiliate  of the
Company shall at any time after the date hereof and prior to the exercise of all
the  Warrants  issue any rights to  subscribe  for shares of Common Stock or any
other  securities of the Company or of such affiliate to all the shareholders of
the Company,  the Holders of the  unexercised  Warrants  shall be  entitled,  in
addition to the



                                      -22-


shares of Common Stock or other  securities  receivable upon the exercise of the
Warrants,  to receive such rights at the time such rights are distributed to the
other shareholders of the Company.

                  9.       Exchange and Replacement of Warrant Certificates.

                  Each Warrant Certificate is exchangeable without expense, upon
the surrender hereof by the registered Holder at the principal  executive office
of  the  Company,  for  a  new  Warrant  Certificate  of  like  tenor  and  date
representing in the aggregate the right to purchase the same number of Shares in
such  denominations  as shall be designated by the Holder thereof at the time of
such surrender.

                  Upon   receipt   by  the   Company  of   evidence   reasonably
satisfactory to it of the loss, theft,  destruction or mutilation of any Warrant
Certificate,  and,  in case of  loss,  theft or  destruction,  of  indemnity  or
security reasonably  satisfactory to it, and reimbursement to the Company of all
reasonable expenses  incidental thereto,  and upon surrender and cancellation of
the  Warrants,  if  mutilated,  the Company  will make and deliver a new Warrant
Certificate of like tenor, in lieu thereof.

                  10.      Elimination of Fractional Interests.

                  The  Company  shall  not be  required  to  issue  certificates
representing  fractions of Shares upon the exercise of the Warrants



                                      -23-


nor  shall  it be  required  to issue  scrip  or pay cash in lieu of  fractional
interests,  it being the intent of the  parties  that all  fractional  interests
shall be  eliminated  by rounding any fraction up to the nearest whole number of
Shares.

                  11.      Reservation and Listing of Securities.

                  The Company shall at all times reserve and keep  available out
of its  authorized  shares of Common  Stock , solely for the purpose of issuance
upon the  exercise of the  Warrants,  such  number of shares of Common  Stock as
shall be issuable upon the exercise  thereof.  The Company  covenants and agrees
that,  upon exercise of the Warrants and payment of the Exercise Price therefor,
all Shares issuable upon such exercise shall be duly and validly  issued,  fully
paid,   non-assessable   and  not  subject  to  the  preemptive  rights  of  any
shareholder. As long as the Warrants shall be outstanding, the Company shall use
its best efforts to cause all shares of Common Stock  issuable upon the exercise
of the  Warrants  to be listed on or quoted by the NASDAQ  National  Market,  or
listed on such national securities exchanges as requested by the Representative.

                  12.      Notices to Warrant Holders.

                  Nothing  contained  in this  Agreement  shall be  construed as
conferring  upon the  Holder or  Holders  the right to vote or to


                                      -24-


consent or to receive  notice as a  shareholder  in respect of any  meetings  of
shareholders for the election of directors or any other matter, or as having any
rights  whatsoever as a shareholder  of the Company.  If,  however,  at any time
prior to the expiration of the Warrants and their exercise, any of the following
events shall occur:

                                    (a) the  Company  shall take a record of the
                  holders  of its  shares of Common  Stock  for the  purpose  of
                  entitling them to receive a dividend or  distribution  payable
                  otherwise  than in cash,  or a cash  dividend or  distribution
                  payable otherwise than out of current or retained earnings, as
                  indicated  by the  accounting  treatment  of such  dividend or
                  distribution on the books of the Company; or

                                    (b)  the  Company  shall  offer  to all  the
                  holders of its shares of Common Stock any additional shares of
                  capital stock of the Company or securities convertible into or
                  exchangeable  for shares of capital  stock of the Company,  or
                  any option, right or warrant to subscribe therefor; or

                                    (c) a dissolution, liquidation or winding up




                                      -25-


                  of the Company (other than in connection with a consoli dation
                  or  merger)  or a  sale  of all  or  substantially  all of its
                  property,   assets  and  business  as  an  entirety  shall  be
                  proposed; or

                                    (d)  reclassification  or  change of the out
                  standing  shares of Common  Stock  (other than a change in par
                  value to no par value,  or from no par value to par value,  or
                  as a result of a subdivision or combination), consolidation of
                  the  Company  with,  or merger of the  Company  into,  another
                  corporation (other than a consolidation or merger in which the
                  Company is the surviving corporation and which does not result
                  in any reclassification or change of the outstanding shares of
                  Common Stock, except a change as a result of a subdivi sion or
                  combination  of such  shares  or a  change  in par  value,  as
                  aforesaid),  or a sale or conveyance to another corporation of
                  the property of the Company as an entirety is proposed; or

                                    (e)  The  Company  or an  affiliate  of  the
                  Company  shall  propose to issue any rights to  subscribe  for
                  shares of Common Stock or any other  securities of the Company
                  or


                                      -26-


                  of such  affiliate  to all the  shareholders  of the  Company;
                  then,  in any one or more of said  events,  the Company  shall
                  give written  notice of such event at least  fifteen (15) days
                  prior  to the  date  fixed  as a  record  date or the  date of
                  closing  the  transfer  books  for  the  determination  of the
                  shareholders   entitled   to  such   dividend,   distribution,
                  convertible or exchangeable securities or subscription rights,
                  options or  warrants,  or  entitled  to vote on such  proposed
                  dissolution,  liquidation,  winding  up or sale.  Such  notice
                  shall  specify  such  record  date or the date of closing  the
                  transfer  books,  as the case  may be.  Failure  to give  such
                  notice or any defect  therein shall not affect the validity of
                  any action taken in connection with the declaration or payment
                  of any such dividend or  distribution,  or the issuance of any
                  convertible or exchangeable securities or subscription rights,
                  options or warrants, or any proposed dissolution, liquidation,
                  winding up or sale.

                  13.      Notices.

                  All  notices,  requests,  consents  and  other  communications
hereunder  shall be in  writing  and shall be deemed to have been duly made when
delivered, or mailed by registered or certified mail, return receipt requested:



                                      -27-


                                    (f)  If  to  a  registered   Holder  of  the
                  Warrants,  to the address of such Holder as shown on the books
                  of the Company; or

                                    (g) If to the  Company,  to the  address set
                  forth in Section 3 of this  Agreement or to such other address
                  as the Company may designate by notice to the Holders.

                  14.      Supplements and Amendments.

                  The  Company  and the  Representative  may  from  time to time
supplement  or amend this  Agreement  without  the  approval  of any  Holders of
Warrant  Certificates  in order to cure any ambiguity,  to correct or supplement
any provision  contained herein which may be defective or inconsistent  with any
provisions  herein,  or to make any other  provisions  in regard to  matters  or
questions  arising hereunder which the Company and the  Representative  may deem
necessary or desirable and which the Company and the Representative  deem not to
adversely affect the interests of the Holders of Warrant Certificates.

                  15.      Successors.

                  All the covenants and  provisions of this  Agreement by or



                                      -28-


for the benefit of the  Company  and the  Holders  inure to the benefit of their
respective successors and assigns hereunder.

         16.      Termination.

                  This  Agreement  shall  terminate  at the close of business on
__________,  200_ [TWO YEARS  AFTER LAST DATE OF  EXERCISE  OF  WARRANTS TO GIVE
SUFFICIENT  COVERAGE FOR  REGISTRATION  OF THE  SECURITIES  AND PERIOD OF SALE.]
Notwithstanding the foregoing, this Agreement will terminate on any earlier date
when all Warrants and  Underlying  Warrants have been  exercised and all Warrant
Securities  have  been  resold  to  the  public;  provided,  however,  that  the
provisions  of Section 7.4 shall  survive  such  termination  until the close of
business  on  _________,  200_ [TWO  YEARS  PLUS THE TIME  PERIOD  ABOVE IN THIS
SECTION 16.].

                  17.      Governing Law.

                  This Agreement and each Warrant  Certificate  issued hereunder
shall be deemed to be a  contract  made  under the laws of the State of New York
and for all  purposes  shall be construed  in  accordance  with the laws of said
State.

                  18.      Benefits of This Agreement.

                  Nothing in this  Agreement  shall be  construed to give to any
person or corporation  other than the Company and the Under-


                                      -29-



writer and any other registered  holder or holders of the Warrant  Certificates,
or Warrant  Securities any legal or equitable right,  remedy or claim under this
Agreement; and this Agreement shall be for the sole and exclusive benefit of the
Company  and the Under  writer and any other  holder or  holders of the  Warrant
Certificates, Warrants or the Shares.

                  19.      Counterparts.

                  This  Agreement may be executed in any number of  counterparts
and  each  of such  counterparts  shall  for all  purposes  be  deemed  to be an
original,  and such counterparts shall together  constitute but one and the same
instrument.

                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Agreement to be duly executed, as of the day and year first above written.


[SEAL]                                      NEXAR TECHNOLOGIES, INC.


                                            By:________________________________
                                               Name:
                                               Title:

Attest:


- -----------------------



                                      -30-


                                            SANDS BROTHERS & CO., LTD.



                                            By:________________________________
                                               Name:
                                               Title:


                                      -31-






                                                                      EXHIBIT A

THE WARRANTS  REPRESENTED BY THIS CERTIFICATE AND THE OTHER SECURITIES  ISSUABLE
UPON EXERCISE THEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933,
AS AMENDED (THE "ACT"), AND MAY NOT BE OFFERED OR SOLD EXCEPT (i) PURSUANT TO AN
EFFECTIVE  REGISTRATION  STATEMENT UNDER THE ACT, (ii) TO THE EXTENT APPLICABLE,
PURSUANT TO RULE 144 UNDER SUCH ACT (OR ANY SIMILAR RULE UNDER SUCH ACT RELATING
TO THE DISPOSITION OF  SECURITIES),  OR (iii) UPON THE DELIVERY BY THE HOLDER TO
THE COMPANY OF AN OPINION OF COUNSEL, REASONABLY SATISFACTORY TO COUNSEL FOR THE
COMPANY,  STATING  THAT  AN  EXEMPTION  FROM  REGISTRATION  UNDER  SUCH  ACT  IS
AVAILABLE.

THE  TRANSFER OR EXCHANGE OF THE WARRANTS  REPRESENTED  BY THIS  CERTIFICATE  IS
RESTRICTED IN ACCORDANCE WITH THE WARRANT AGREEMENT REFERRED TO HEREIN.

                            EXERCISABLE ON OR BEFORE
                    5:00 P.M., NEW YORK TIME, _________, 2002

No. W-                                                          _______ Warrants

                               WARRANT CERTIFICATE

                  This Warrant Certificate  certifies that Sands Brothers & Co.,
Ltd. or registered  assigns,  is the  registered  holder of _______  Warrants to
purchase, at any time from _______,  1998_ until 5:00 P.M. New York City time on
________,  2002 ("Expiration  Date"), up to _____ fully paid and  non-assessable
shares  ("Shares") of Common Stock, par value $0.01 per share ("Common  Stock"),
of Nexar  Technologies,  Inc., a Delaware  corporation (the  "Company"),  at the
initial  exercise price,  subject to adjustment in certain events (the "Exercise
Price"),  of $_____ per Share,  upon surrender of this Warrant  Certificate  and
payment of the Exercise Price at an office or agency of the Company, but subject
to the  conditions  set forth  herein and in the warrant  agreement  dated as of
____________,  1997  between  the Company and Sands  Brothers & Co.,  Ltd.  (the
"Warrant  Agreement").  Payment of the Exercise Price may be made in cash, or by
certified or official bank check in New York Clearing House funds payable to the
order of the Company, or any combination



                                      -32-


of cash or check.

                  No Warrant  may be  exercised  after 5:00 P.M.,  New York City
time,  on the  Expiration  Date,  at which time all Warrants evi denced  hereby,
unless exercised prior thereto, shall thereafter be void.

                  The Warrants evidenced by this Warrant Certificate are part of
a duly authorized  issue of Warrants  issued pursuant to the Warrant  Agreement,
which Warrant  Agreement is hereby  incorporated by reference in and made a part
of this  instrument  and is hereby  referred to in a description  of the rights,
limitation  of rights,  obligations,  duties and  immunities  thereunder  of the
Company and the holders (the words "holders" or "holder"  meaning the registered
holders or registered holder) of the Warrants.

                  The Warrant  Agreement  provides  that upon the  occurrence of
certain  events,  the Exercise  Price and/or number of the Company's  securities
issuable  thereupon may,  subject to certain  conditions,  be adjusted.  In such
event,  the Company  will,  at the  request of the  holder,  issue a new Warrant
Certificate  evidencing  the  adjustment  in the  Exercise  Price and the number
and/or type of securities issuable upon the exercise of the Warrants;  provided,
however,  that the failure of the Company to issue such new Warrant Certificates
shall not in any way  change,  alter,  or  otherwise  impair,  the rights of the
holder as set forth in the Warrant Agreement.

                  Upon due  presentment  for  registration  of  transfer of this
Warrant  Certificate  at an  office  or agency  of the  Company,  a new  Warrant
Certificate  or  Warrant  Certificates  of  like  tenor  and  evidencing  in the
aggregate  a like  number of Warrants  shall be issued to the  transferee(s)  in
exchange for this Warrant  Certi  ficate,  subject to the  limitations  provided
herein and in the Warrant  Agreement,  without any charge except for any tax, or
other governmental charge imposed in connection therewith.

                  Upon the exercise of less than all of the  Warrants  evidenced
by this  Certificate,  the Company shall  forthwith issue to the holder hereof a
new Warrant Certificate representing such number of unexercised Warrants.

                  The Company may deem and treat the registered holder(s) hereof
as the  absolute  owner(s)  of this  Warrant  Certificate  (notwithstanding  any
notation of ownership or other writing  hereon


                                      -33-



made by anyone), for the purpose of any exercise hereof, and of any distribution
to the holder(s) hereof,  and for all other purposes,  and the Company shall not
be affected by any notice to the contrary.

                  All terms used in this Warrant  Certificate  which are defined
in the Warrant Agreement shall have the meanings assigned to them in the Warrant
Agreement.


                                      -34-





                  IN  WITNESS  WHEREOF,  the  Company  has caused  this  Warrant
Certificate to be duly executed under its corporate seal.


Dated:  ___________, 1997                       NEXAR TECHNOLOGIES, INC.


[SEAL]                                          By:__________________________
                                                   Name:
                                                   Title:
Attest:
- ----------------------


                                      -35-



                         [FORM OF ELECTION TO PURCHASE]

                  The  undersigned  hereby  irrevocably  elects to exercise  the
right, represented by this Warrant Certificate, to purchase _________ Shares and
herewith tenders in payment for such Shares cash or a certified or official bank
check  payable  in  New  York  Clearing  House  Funds  to  the  order  of  NEXAR
TECHNOLOGIES,  INC. in the amount of $______ , all in accordance  with the terms
hereof.  The  undersigned  requests  that  a  certificate  for  such  Shares  be
registered in the name of , whose address is  __________________,  and that such
Certificate be delivered to __________________, whose address is _____________.


Dated:                                  Signature:_________________

                                        (Signature  must conform in
                                        all  respects  to  name  of
                                        holder as  specified on the
                                        face    of   the    Warrant
                                        Certificate.)

                        --------------------------------

                        --------------------------------
                        (Insert Social Security or Other
                          Identifying Number of Holder)



                                      -36-



                              [FORM OF ASSIGNMENT]

             (To be executed by the registered holder if such holder
                  desires to transfer the Warrant Certificate.)


                  FOR VALUE RECEIVED _______________________________________

hereby sells, assigns and transfers unto

____________________________________________________________________________
(Please print name and address of transferee)

this Warrant  Certificate,  together with all right, title and interest therein,
and does hereby irrevocably constitute and appoint _______________, Attorney, to
transfer  the  within  Warrant  Certificate  on the  books  of the  within-named
Company, with full power of substitution.


Dated:                                  Signature: ___________________

                                        (Signature must conform in all
                                        respects to  name of holder as
                                        specified  on  the face of the
                                        Warrant Certificate)


- -------------------------------

- -------------------------------
(Insert Social Security or Other
Identifying  Number of Assignee)




                                      -37-