Registration Rights Agreement


                                   dated as of


                                  May 25, 2004


                                 by and between


                                  Avitar, Inc.


                                       and


                      GCA Strategic Investment Fund Limited




                                TABLE OF CONTENTS

1.       Introduction.........................................................1
         i.       Securities Purchase Agreement...............................1
         ii.      Definition of Securities....................................1
         iii.     National Market Representation..............................1
2.       Registration under Securities Act, etc...............................1
         2.1      Mandatory Registration......................................1
                  i.       Registration of Registrable Securities.............1
                  ii.      Registration Statement Form........................2
                  iii.     Expenses...........................................2
                  iv.      Effective Registration Statement...................2
                  v.       Plan of Distribution...............................2
         2.2      Incidental Registration.....................................2
                  i.       Right to Include Registrable Securities............2
                  ii.      Priority in Incidental Registrations...............3
         2.3      Registration Procedures.....................................3
         2.4      Underwritten Offerings......................................7
                  i.       Incidental Underwritten Offerings..................7
                  ii.      Holdback Agreements................................7
                  iii.     Participation in Underwritten Offerings............7
         2.5      Preparation; Reasonable Investigation.......................8
         2.6      Registration Default Fee....................................8
         2.7      Indemnification.............................................8
                  i.       Indemnification by the Company.....................8
                  ii.      Indemnification by the Sellers.....................9
                  iii.     Notices of Claims, etc.............................9
                  iv.      Other Indemnification.............................10
                  v.       Indemnification Payments..........................10
                  vi.      Contribution......................................10
3.       Definitions.........................................................11
4.       Rule 144............................................................13
5.       Amendments and Waivers..............................................13
6.       Nominees for Beneficial Owners......................................14
7.       Notices.............................................................14
8.       Assignment..........................................................14
9.       Descriptive Headings................................................14
10.      GOVERNING LAW.......................................................15
11.      Counterparts........................................................15
12.      Entire Agreement....................................................15
13.      Severability........................................................15



                          Registration Rights Agreement


     REGISTRATION RIGHTS AGREEMENT (this "Agreement"), dated as of May 14, 2004,
among Avitar,  Inc., a Delaware  corporation (the "Company"),  and GCA Strategic
Investment Fund Limited (the "Fund").

1. Introduction.

     i.  Securities  Purchase  Agreement.  The  Company  and the Fund have today
executed that certain Securities  Purchase  Agreement (the "Securities  Purchase
Agreement"),  pursuant to which the Fund has  agreed,  among  other  things,  to
purchase 1,000 shares of its Series A Preferred  Stock,  4% Cumulative  Dividend
(the "Preferred Stock"). In addition,  the Company has issued to the Fund Common
Stock Purchase Warrants  exercisable for up to an aggregate of 100,000 shares of
the Company's common stock,  $0.01 par value per share (the "Common Stock") (the
"Warrant  Shares").  The number of Warrant Shares is subject to adjustment  upon
the occurrence of stock splits,  recapitalization  and similar events  occurring
after the date hereof.

     ii.  Definition of Securities.  The Common Stock issued upon  conversion of
the Preferred Stock and the Warrant Shares are  collectively  herein referred to
as the "Securities."

     iii. National Market  Representation.  The Company  represents and warrants
that the  Company's  Common  Stock is  currently  eligible  for  trading  on the
American  Stock Exchange  ("Amex")  under the symbol "AVR." Certain  capitalized
terms used in this  Agreement  are  defined in Section 3 hereof;  references  to
sections shall be to sections of this Agreement.

2. Registration under Securities Act, etc.

     2.1 Mandatory Registration.

     i. Registration of Registrable  Securities.  The Company will file with the
Commission,  within 30 days following the date hereof, a Registration  Statement
on Form S-3 (the "Registration  Statement") to register the resale of the Common
Shares issuable upon the exercise of the Warrants. The Company will use its best
efforts to cause the  Registration  Statement to become  effective within (i) 90
days of the Date  hereof,  (ii) ten (10) days  following  the  receipt  of a "No
Review" or similar  letter from the  Commission or (iii) the first day following
the day the Commission  determines  the  Registration  Statement  eligible to be
declared effective (the "Required Effectiveness Date"). Nothing contained herein
shall be deemed to limit the number of  Registrable  Securities to be registered
by the Company  hereunder.  As a result,  should the Registration  Statement not
relate  to  the  maximum  number  of  Registrable  Securities  acquired  by  (or
potentially  acquirable by) the holders thereof upon conversion of the Preferred
Stock, or exercise of the Common Stock Purchase Warrants  described in Section 1
above,  the Company shall be required to promptly  file a separate  registration
statement  (utilizing  Rule  462  promulgated  under  the  Exchange  Act,  where
applicable)   relating  to  such   Registrable   Securities  which  then  remain
unregistered. The provisions of this Agreement shall relate to any such separate
registration statement as if it were an amendment to the Registration Statement.

     ii. Registration Statement Form. Registrations under this Section 2.1 shall
be on Form S-3 or such other appropriate  registration form of the Commission as
shall permit the disposition of such  Registrable  Securities in accordance with
the intended method or methods of disposition  specified by the Fund;  provided,
however,  such intended  method of deposition  shall not include an underwritten
offering of the Registrable Securities.

     iii. Expenses. The Company will pay all Registration Expenses in connection
with any registration required by this Section 2.1.

     iv. Effective Registration  Statement. A registration requested pursuant to
this  Section  2.1  shall  not be deemed  to have  been  effected  (i)  unless a
registration statement with respect thereto has become effective,  provided that
a  registration  which  does not  become  effective  after the  Company  filed a
registration  statement with respect  thereto solely by reason of the refusal to
proceed of any holder of Registrable Securities (other than a refusal to proceed
based upon the advice of counsel in the form of a letter  signed by such counsel
and provided to the Company  relating to a disclosure  matter  unrelated to such
holder) shall be deemed to have been effected by the Company  unless the holders
of the  Registrable  Securities  shall  have  elected  to pay  all  Registration
Expenses in  connection  with such  registration,  (ii) if,  after it has become
effective,  such registration  becomes subject to any stop order,  injunction or
other order or extraordinary requirement of the Commission or other governmental
agency or court for any reason or (iii) if, after it has become effective,  such
registration  ceases to be  effective  for more than an aggregate of ninety (90)
days.

     v. Plan of  Distribution.  The Company hereby agrees that the  Registration
Statement shall include a plan of distribution section reasonably  acceptable to
the Fund; provided, however, such plan of distribution section shall be modified
by the  Company so as to not  provide  for the  disposition  of the  Registrable
Securities on the basis of an underwritten offering.

     2.2 Incidental Registration.

     i.  Right to  Include  Registrable  Securities.  If any time after the date
hereof but before the third anniversary of the date hereof, the Company proposes
to register  any of its  securities  under the  Securities  Act (other than by a
registration  in  connection  with an  acquisition  in a manner  which would not
permit  registration of Registrable  Securities for sale to the public,  on Form
S-8, or any successor  form thereto,  on Form S-4, or any successor form thereto
and other than  pursuant  to Section  2.1),  on an  underwritten  basis  (either
best-efforts  or  firm-commitment),  then,  the  Company  will at such time give
prompt  written  notice to all  Holders  of its  intention  to do so and of such
Holders'  rights under this Section  2.2.  Upon the written  request of any such
Holder made within  twenty (20) days after the receipt of any such notice (which
request shall specify the Registrable  Securities  intended to be disposed of by
such Holder an and the  intended  method of  disposition  thereof),  the Company
will, subject to the terms of this Agreement,  effect the registration under the
Securities Act of the Registrable Securities,  to the extent requisite to permit
the disposition  (in accordance with the intended  methods thereof as aforesaid)
of  such  Registrable  Securities  so to be  registered,  by  inclusion  of such
Registrable Securities in the registration statement which covers the securities
which the Company  proposes  to  register,  provided  that if, at any time after
written  notice of its  intention  to register any  securities  and prior to the
effective  date of the  registration  statement  filed in  connection  with such
registration,  the Company shall determine for any reason either not to register
or to delay  registration of such securities,  the Company may, at its election,
give written notice of such determination to each Holder and, thereupon,  (i) in
the  case  of a  determination  not to  register,  shall  be  relieved  of  this
obligation  to register  any  Registrable  Securities  in  connection  with such
registration  (but not from its obligation to pay the  Registration  Expenses in
connection therewith),  without prejudice,  however, to the rights of any holder
or holders of  Registrable  Securities  entitled  to do so to request  that such
registration  be effected as a  registration  under Section 2.1, and (ii) in the
case of a  determination  to  delay  registering,  shall be  permitted  to delay
registering  any  Registrable  Securities,  for the same  period as the delay in
registering such other securities.  No registration  effected under this Section
2.2 shall relieve the Company of its obligation to effect any registration  upon
request under Section 2.1, nor shall any such  registration  hereunder be deemed
to have  been  effected  pursuant  to  Section  2.1.  The  Company  will pay all
Registration  Expenses  in  connection  with each  registration  of  Registrable
Securities  requested  pursuant to this  Section  2.2.  The right  provided  the
Holders  of the  Registrable  Securities  pursuant  to  this  Section  shall  be
exercisable  at  their  sole  discretion  and  will in no way  limit  any of the
Company's obligations to pay the Securities according to their terms.

     ii. Priority in Incidental  Registrations.  If the managing  underwriter of
the  underwritten  offering  contemplated  by this  Section 2.2 shall inform the
Company and holders of the Registrable  Securities  requesting such registration
by letter of its belief that the number of  securities  requested to be included
in such registration exceeds the number which can be sold in such offering, then
the Company will include in such registration, to the extent of the number which
the Company is so advised  can be sold in such  offering,  (i) first  securities
proposed  by the  Company  to be sold  for its own  account,  and  (iii)  second
Registrable   Securities  and  securities  of  other  selling  security  holders
requested  to be  included  in such  registration  pro rata on the  basis of the
number of shares of such  securities  so proposed to be sold and so requested to
be included; provided, however, the holders of Registrable Securities shall have
priority to all shares  sought to be included by officers  and  directors of the
Company as well as holders of ten percent (10%) or more of the Company's  Common
Stock.







     2.3  Registration  Procedures.  If and  whenever the Company is required to
effect the  registration of any Registrable  Securities under the Securities Act
as provided  in Section  2.1 and, as  applicable,  2.2,  the Company  shall,  as
expeditiously as possible:

     i.  prepare and file with the  Commission  the  Registration  Statement  to
effect such registration  (including such audited financial statements as may be
required  by the  Securities  Act  or  the  rules  and  regulations  promulgated
thereunder)  and  thereafter  use its best  efforts to cause  such  registration
statement to be declared  effective by the  Commission,  as soon as practicable,
but in any event no later than the Required  Effectiveness Date (with respect to
a registration  pursuant to Section 2.1); provided,  however, that before filing
such registration  statement or any amendments thereto, the Company will furnish
to the counsel selected by the holders of Registrable Securities which are to be
included  in such  registration,  copies of all such  documents  proposed  to be
filed;

     ii. with  respect to any  Registration  Statement  pursuant to Section 2.1,
prepare and file with the Commission  such  amendments  and  supplements to such
registration statement and the prospectus used in connection therewith as may be
necessary to keep such registration  statement  effective and to comply with the
provisions  of  the  Securities  Act  with  respect  to the  disposition  of all
Registrable Securities covered by such registration statement, until the earlier
to occur of six (6) years after the date of this  Agreement(subject to the right
of the  Company  to  suspend  the  effectiveness  thereof  for not more  than 10
consecutive  days or an  aggregate  of 30 days in such six (6) years  period) or
such time as all of the  securities  which are the subject of such  registration
statement  cease to be Registrable  Securities  (such period,  in each case, the
"Registration Maintenance Period");

     iii.  furnish  to each  seller of  Registrable  Securities  covered by such
registration  statement  such number of  conformed  copies of such  registration
statement  and of each  such  amendment  and  supplement  thereto  (in each case
including all exhibits),  such number of copies of the  prospectus  contained in
such  registration  statement  (including  each  preliminary  prospectus and any
summary  prospectus)  and any other  prospectus  filed  under Rule 424 under the
Securities Act, in conformity  with the  requirements of the Securities Act, and
such other  documents,  as such seller and  underwriter,  if any, may reasonably
request in order to  facilitate  the  public  sale or other  disposition  of the
Registrable Securities owned by such seller;

     iv. use its  reasonable  efforts to  register  or qualify  all  Registrable
Securities and other  securities  covered by such  registration  statement under
such  other  securities  laws  or blue  sky  laws as any  seller  thereof  shall
reasonably  request,  to keep such registrations or qualifications in effect for
so long as such  registration  statement  remains in effect,  and take any other
action which may be reasonably necessary to enable such seller to consummate the
disposition in such jurisdictions of the securities owned by such seller, except
that the Company shall not for any such purpose be required to qualify generally
to do business as a foreign corporation in any jurisdiction wherein it would not
but for  the  requirements  of  this  subdivision  (iv)  be  obligated  to be so
qualified or to consent to general service of process in any such jurisdiction;








     v. use its best efforts to cause all Registrable Securities covered by such
registration  statement  to  be  registered  with  or  approved  by  such  other
governmental agencies or authorities as may be necessary to enable the seller or
sellers thereof to consummate the disposition of such Registrable Securities;

     vi. furnish to each seller of Registrable  Securities a signed counterpart,
addressed to such seller, and the underwriters, if any, of:

          (A) an opinion of counsel for the Company, dated the effective date of
     such  registration   statement  (or,  if  such  registration   includes  an
     underwritten  public  offering,  an opinion  dated the date of the  closing
     under  the  underwriting  agreement),reasonably  satisfactory  in form  and
     substance to such seller)  including that the prospectus and any prospectus
     supplement forming a part of the Registration Statement does not contain an
     untrue statement of a material fact or omits a material fact required to be
     stated  therein or necessary in order to make the  statements  therein,  in
     light of the circumstances under which they were made, not misleading, and

          (B) a "comfort"  letter (or, in the case of any Person  which does not
     satisfy  the  conditions  for receipt of a "comfort"  letter  specified  in
     Statement  on  Auditing  Standards  No.  72, an  "agreed  upon  procedures"
     letter),  dated the effective date of such registration  statement (and, if
     such  registration  includes an underwritten  public offering,  a letter of
     like kind dated the date of the closing under the underwriting  agreement),
     signed  by the  independent  public  accountants  who  have  certified  the
     Company's  financial  statement  included in such  registration  statement,
     covering  substantially  the same matters with respect to such registration
     statement  (and the  prospectus  included  therein) and, in the case of the
     accountants'  letter, with respect to events subsequent to the date of such
     financial  statements,  as are customarily  covered in opinions of issuer's
     counsel  and in  accountants'  letters  delivered  to the  underwriters  in
     underwritten  public  offerings  of  securities  (with,  in the  case of an
     "agreed upon procedures"  letter, such modifications or deletions as may be
     required under Statement on Auditing  Standards No. 35) and, in the case of
     the accountants' letter, such other financial matters,  and, in the case of
     the legal  opinion,  such  other  legal  matters,  as such  seller  (or the
     underwriters, if any) may reasonably request;

     vii.  notify the  Sellers'  Representative  and its  counsel  promptly  and
confirm such advice in writing promptly after the Company has knowledge thereof:

          (A) when the Registration Statement,  the prospectus or any prospectus
     supplement related thereto or post-effective  amendment to the Registration
     Statement has been filed,  and, with respect to the Registration  Statement
     or  any  post-effective   amendment  thereto,  when  the  same  has  become
     effective;

          (B) of any request by the  Commission for amendments or supplements to
     the Registration Statement or the prospectus or for additional information;

          (C) of the issuance by the Commission of any stop order suspending the
     effectiveness  of  the  Registration  Statement  or the  initiation  of any
     proceedings by any Person for that purpose; and







          (D) of the receipt by the Company of any notification  with respect to
     the suspension of the qualification of any Registrable  Securities for sale
     under the securities or blue sky laws of any jurisdiction or the initiation
     or threat of any proceeding for such purpose;

     viii.  notify  each  seller  of  Registrable  Securities  covered  by  such
registration  statement,  at any time  when a  prospectus  relating  thereto  is
required to be delivered  under the Securities Act, upon discovery that, or upon
the happening of any event as a result of which, the prospectus included in such
registration  statement,  as then in effect,  includes an untrue  statement of a
material fact or omits to state any material facts required to be stated therein
or necessary to make the  statements  therein not misleading in the light of the
circumstances  then  existing,  and at the request of any such  seller  promptly
prepare and furnish to such seller a reasonable number of copies of a supplement
to or an amendment of such prospectus as may be necessary so that, as thereafter
delivered  to the  purchasers  of such  securities,  such  prospectus  shall not
include an untrue  statement of a material fact or omit to state a material fact
required to be stated  therein or necessary to make the  statements  therein not
misleading in the light of the circumstances then existing;

     ix. use its best efforts to obtain the  withdrawal of any order  suspending
the effectiveness of the Registration Statement at the earliest possible moment;

     x. otherwise use its best efforts to comply with all  applicable  rules and
regulations of the Commission,  and make available to its security  holders,  as
soon as reasonably practicable,  an earnings statement covering the period of at
least twelve months, but not more than eighteen months, beginning with the first
full calendar  month after the effective  date of such  registration  statement,
which  earnings  statement  shall satisfy the provisions of Section 11(a) of the
Securities Act and Rule 158 thereunder;

     xi. enter into such  agreements and take such other actions as the Sellers'
Representative  shall  reasonably  request  in  writing  (at the  expense of the
requesting  or  benefiting  sellers)  in order to  expedite  or  facilitate  the
disposition of such Registrable Securities; and

     xii. use its best  efforts to list all  Registrable  Securities  covered by
such  registration  statement  on any  securities  exchange  on which any of the
Registrable Securities are then listed.

     The Company may require each seller of  Registrable  Securities as to which
any  registration  is being  effected to furnish the  Company  such  information
regarding such seller and the distribution of such securities as the Company may
from time to time reasonably request in writing.

     The Company will not file any  registration  statement  pursuant to Section
2.1, or amendment thereto or any prospectus or any supplement thereto (including
such  documents  incorporated  by  reference  and proposed to be filed after the
initial   filing  of  the   Registration   Statement)   to  which  the  Sellers'
Representative shall reasonably object,  provided that the Company may file such
documents in a form required by law or upon the advice of its counsel.







     The  Company   represents  and  warrants  to  each  holder  of  Registrable
Securities   that  it  has  obtained  all   necessary   waivers,   consents  and
authorizations   necessary  to  execute  this   Agreement  and   consummate  the
transactions  contemplated  hereby  other  than such  waivers,  consents  and/or
authorizations specifically contemplated by the Securities Purchase Agreement.

     The Fund agrees  that,  upon  receipt of any notice from the Company of the
occurrence  of any event of the kind  described  in  subdivision  (viii) of this
Section 2.3,  the Fund will  forthwith  discontinue  the Fund's  disposition  of
Registrable  Securities pursuant to the Registration  Statement relating to such
Registrable   Securities   until  the  Fund's  receipt  of  the  copies  of  the
supplemented or amended  prospectus  contemplated by subdivision  (viii) of this
Section 2.3 and, if so directed by the Company,  will deliver to the Company (at
the Company's expense) all copies, other than permanent file copies, then in the
Fund's  possession of the  prospectus  relating to such  Registrable  Securities
current at the time of receipt of such notice.

     2.4 Underwritten Offerings.

     i. Incidental  Underwritten  Offerings. If the Company at any time proposes
to register any of its securities  under the Securities Act as  contemplated  by
Section 2.2 and such  securities are to be distributed by or through one or more
underwriters,  the  Company  will,  if  requested  by any holder of  Registrable
Securities  as provided in Section 2.2 and subject to the  provisions of Section
2.2(i),  use its reasonable  efforts to arrange for such underwriters to include
all the  Registrable  Securities to be offered and sold by such holder among the
securities to be distributed by such underwriters.

     ii. Holdback Agreements.  Subject to such other reasonable  requirements as
may be  imposed by the  underwriter  as a  condition  of  inclusion  of a Fund's
Registrable  Securities  in the  registration  statement,  each  Fund  agrees by
acquisition  of  Registrable   Securities,   if  so  required  by  the  managing
underwriter, not to sell, make any short sale of, loan, grant any option for the
purchase of, effect any public sale or distribution of or otherwise  dispose of,
except as part of such underwritten  registration,  any equity securities of the
Company,  during such  reasonable  period of time requested by the  underwriter;
provided however,  such period shall not exceed the 120 day period commencing 30
days prior to the commencement of such underwritten  offering and ending 90 days
following the completion of such underwritten offering.







     iii.  Participation  in  Underwritten  Offerings.  No holder of Registrable
Securities may participate in any underwritten offering under Section 2.2 unless
such  holder  of  Registrable  Securities  (i)  agrees  to  sell  such  Person's
securities  on the basis  provided in any  underwriting  arrangements  approved,
subject to the terms and  conditions  hereof,  by the  holders of a majority  of
Registrable  Securities  to be included in such  underwritten  offering and (ii)
completes and executes all questionnaires,  indemnities, underwriting agreements
and other documents (other than powers of attorney)  required under the terms of
such underwriting  arrangements.  Notwithstanding the foregoing, no underwriting
agreement (or other  agreement in connection  with such offering)  shall require
any holder of Registrable Securities to make an representations or warranties to
or agreements with the Company or the  underwriters  other than  representations
and warranties contained in a writing furnished by such holder expressly for use
in  the  related  registration  statement  or  representations,   warranties  or
agreements regarding such holder, such holder's Registrable  Securities and such
holder's intended method of distribution and any other  representation  required
by law.

     2.5  Preparation;   Reasonable   Investigation.   In  connection  with  the
preparation and filing of each  registration  statement under the Securities Act
pursuant to this  Agreement,  the Company  will give the holders of  Registrable
Securities  registered under such registration  statement,  and their respective
counsel and  accountants,  the  opportunity to participate in the preparation of
such registration statement,  each prospectus included therein or filed with the
Commission, and each amendment thereof or supplement thereto, and will give each
of them such access to its books and records and such  opportunities  to discuss
the  business  of the  Company  with its  officers  and the  independent  public
accountants  who have certified its financial  statements as shall be necessary,
in the  reasonable  opinion of such holders' and such  underwriters'  respective
counsel,  to  conduct a  reasonable  investigation  within  the  meaning  of the
Securities Act.

     2.6 Registration Default Fee. If the Registration Statement contemplated in
Section 2.1 is (x) not declared effective by the Required  Effectiveness Date or
(y)  such  effectiveness  is not  maintained  for the  Registration  Maintenance
Period,  then the  Company  shall  pay to the Fund the  applicable  Default  Fee
specified in Section 10.4 of the Securities Purchase Agreement.

     2.7 Indemnification.







     i.  Indemnification by the Company. In the event of any registration of any
securities of the Company under the Securities Act, the Company will, and hereby
does  agree to  indemnify  and  hold  harmless  the  holder  of any  Registrable
Securities covered by such registration  statement,  its directors and officers,
each other Person who  participates as an underwriter in the offering or sale of
such  securities and each other Person,  if any, who controls such holder or any
such  underwriter  within the meaning of the  Securities Act against any losses,
claims,  damages or liabilities,  joint or several,  to which such holder or any
such director or officer or underwriter or controlling person may become subject
under the Securities Act or otherwise,  insofar as such losses,  claims, damages
or liabilities (or actions or proceedings,  whether commenced or threatened,  in
respect  thereof) arise out of or are based upon any untrue statement or alleged
untrue  statement of any material fact contained in any  registration  statement
under which such  securities  were  registered  under the  Securities  Act,  any
preliminary  prospectus,   final  prospectus  or  summary  prospectus  contained
therein,  or any  amendment or  supplement  thereto,  or any omission or alleged
omission  to state  therein a material  fact  required  to be stated  therein or
necessary to make the statements  therein not  misleading,  and the Company will
reimburse  such  holder  and  each  such  director,  officer,   underwriter  and
controlling  person for any legal or any other expenses  reasonably  incurred by
them in  connection  with  investigating  or  defending  any such  loss,  claim,
liability,  action or proceeding,  provided that the Company shall not be liable
in any such case to the extent that any such loss, claim, damage, liability, (or
action or  proceeding in respect  thereof) or expense  arises out of or is based
upon an untrue  statement  or alleged  untrue  statement  or omission or alleged
omission made in such registration  statement,  any such preliminary prospectus,
final prospectus,  summary prospectus,  amendment or supplement in reliance upon
and in  conformity  with  written  information  furnished to the Company by such
holder or underwriter stating that it is for use in the preparation thereof and,
provided  further  that the  Company  shall  not be  liable  to any  Person  who
participates as an underwriter in the offering or sale of Registrable Securities
or to any other Person, if any, who controls such underwriter within the meaning
of the Securities Act, in any such case to the extent that any such loss, claim,
damage, liability (or action or proceeding in respect thereof) or expense arises
out of such Person's failure to send or give a copy of the final prospectus,  as
the same may be then  supplemented  or amended,  within the time required by the
Securities Act to the Person  asserting the existence of an untrue  statement or
alleged  untrue  statement  or omission  or alleged  omission at or prior to the
written  confirmation  of the sale of  Registrable  Securities to such Person if
such  statement  or  omission  was  corrected  in such  final  prospectus  or an
amendment or supplement  thereto.  Such indemnity shall remain in full force and
effect  regardless of any  investigation  made by or on behalf of such holder or
any such director, officer,  underwriter or controlling person and shall survive
the transfer of such securities by such holder.

     ii. Indemnification by the Sellers. The Company may require, as a condition
to including any  Registrable  Securities in any  registration  statement  filed
pursuant to this  Agreement,  the  Company  shall have  received an  undertaking
satisfactory to it from the prospective  seller of such Registrable  Securities,
to indemnify and hold harmless (in the same manner and to the same extent as set
forth in subdivision (i) of this Section 2.7) the Company,  each director of the
Company, each officer of the Company and each other Person, if any, who controls
the  Company  within the  meaning of the  Securities  Act,  with  respect to any
statement  or alleged  statement  in or omission or alleged  omission  from such
registration statement, any preliminary prospectus,  final prospectus or summary
prospectus  contained therein,  or any amendment or supplement  thereto, if such
statement  or alleged  statement  or  omission or alleged  omission  was made in
reliance  upon and in  conformity  with  written  information  furnished  to the
Company through an instrument duly executed by such seller specifically  stating
that  it  is  for  use  in  the  preparation  of  such  registration  statement,
preliminary  prospectus,  final  prospectus,  summary  prospectus,  amendment or
supplement. Any such indemnity shall remain in full force and effect, regardless
of any  investigation  made by or on behalf of the Company or any such director,
officer or controlling  person and shall survive the transfer of such securities
by such seller.







     iii. Notices of Claims, etc. Promptly after receipt by an indemnified party
of notice of the  commencement  of any action or  proceeding  involving  a claim
referred to in the preceding  subdivisions of this Section 2.7, such indemnified
party will, if a claim in respect  thereof is to be made against an indemnifying
party,  give written  notice to the latter of the  commencement  of such action,
provided  that the failure of any  indemnified  party to give notice as provided
herein shall not relieve the  indemnifying  party of its  obligations  under the
preceding  subdivisions  of this  Section  2.7,  except to the  extent  that the
indemnifying  party is actually  prejudiced  by such failure to give notice.  In
case any such action is brought  against an  indemnified  party,  unless in such
indemnified  party's  reasonable  judgment a conflict of interest  between  such
indemnified  and  indemnifying  parties may exist in respect of such claim,  the
indemnifying party shall be entitled to participate in and to assume the defense
thereof,  jointly with any other indemnifying party similarly  notified,  to the
extent  that  the   indemnifying   party  may  wish,  with  counsel   reasonably
satisfactory to such  indemnified  party, and after notice from the indemnifying
party to such  indemnified  party  of its  election  so to  assume  the  defense
thereof,  the indemnifying  party shall not be liable to such indemnified  party
for  any  legal  or  other  expenses  subsequently  incurred  by the  latter  in
connection   with  the  defense   thereof   other  than   reasonable   costs  of
investigation.   No  indemnifying  party  shall,  without  the  consent  of  the
indemnified party, consent to entry of any judgment or enter into any settlement
of any such action which does not include as an  unconditional  term thereof the
giving by the claimant or plaintiff to such indemnified  party of a release from
all liability, or a covenant not to sue, in respect to such claim or litigation.
No  indemnified  party shall  consent to entry of any judgment or enter into any
settlement  of any such  action  the  defense  of which has been  assumed  by an
indemnifying party without the consent of such indemnifying party.

     iv. Other Indemnification. Indemnification similar to that specified in the
preceding  subdivisions  of this  Section 2.7 (with  appropriate  modifications)
shall be given by the  Company and each seller of  Registrable  Securities  (but
only if and to the  extent  required  pursuant  to the  terms of  2.7(ii))  with
respect to any required  registration or other qualification of securities under
any Federal or state law or regulation of any governmental authority, other than
the Securities Act.

     v. Indemnification  Payments. The indemnification  required by this Section
2.7 shall be made by periodic  payments of the amount  thereof during the course
of the  investigation  or  defense,  as and when bills are  received or expense,
loss, damage or liability is incurred.







     vi.  Contribution.  If the  indemnification  provided for in the  preceding
subdivision  of this  Section  2.7 is  unavailable  to an  indemnified  party in
respect of any expense,  loss, claim,  damage or liability  referred to therein,
then each indemnifying  party, in lieu of indemnifying  such indemnified  party,
shall  contribute to the amount paid or payable by such  indemnified  party as a
result of such expense,  loss, claim, damage or liability (i) in such proportion
as is  appropriate to reflect the relative  benefits  received by the Company on
the one hand and the  holder  or  underwriter,  as the case may be, on the other
from the  distribution of the  Registrable  Securities or (ii) if the allocation
provided  by clause  (i)  above is not  permitted  by  applicable  law,  in such
proportion as is appropriate to reflect not only the relative  benefits referred
to in clause  (i) above but also the  relative  fault of the  Company on the one
hand and of the  holder  or  underwriter,  as the case may be,  on the  other in
connection  with the  statements  or omissions  which  resulted in such expense,
loss,   damage  or  liability,   as  well  as  any  other   relevant   equitable
considerations.  The relative  benefits  received by the Company on the one hand
and the holder or  underwriter,  as the case may be, on the other in  connection
with the distribution of the Registrable Securities shall be deemed to be in the
same  proportion  as the total net  proceeds  received by the  Company  from the
initial sale of the Registrable Securities by the Company to the purchasers bear
to the gain,  if any,  realized by all  selling  holders  participating  in such
offering  or  the  underwriting   discounts  and  commissions  received  by  the
underwriter,  as the case may be. The  relative  fault of the Company on the one
hand and of the holder or underwriter, as the case may be, on the other shall be
determined by reference  to, among other  things,  whether the untrue or alleged
untrue statement of a material fact or omission to state a material fact relates
to information  supplied by the Company, by the holder or by the underwriter and
the parties' relative intent,  knowledge,  access to information supplied by the
Company,  by the holder or by the underwriter and the parties'  relative intent,
knowledge,  access to  information  and  opportunity  to correct or prevent such
statement or omission,  provided that the foregoing contribution agreement shall
not inure to the benefit of any indemnified  party if  indemnification  would be
unavailable to such indemnified  party by reason of the provisions  contained in
the first sentence of subdivision (i) of this Section 2.7, and in no event shall
the obligation of any  indemnifying  party to contribute  under this subdivision
(vi) exceed the amount that such indemnifying party would have been obligated to
pay  by  way  of  indemnification  if the  indemnification  provided  for  under
subdivisions   (ii)  of  this   Section  2.7  had  been   available   under  the
circumstances.

     The Company and the holders of Registrable  Securities  agree that it would
not be just and equitable if contribution pursuant to this subdivision (vi) were
determined by pro rata allocation (even if the holders and any underwriters were
treated as one entity for such  purpose)  or by any other  method of  allocation
that does not take account of the  equitable  considerations  referred to in the
immediately  preceding  paragraph.  The amount paid or payable by an indemnified
party as a result of the losses,  claims, damages and liabilities referred to in
the immediately  preceding paragraph shall be deemed to include,  subject to the
limitations set forth in the preceding  sentence and  subdivision  (iii) of this
Section 2.7, 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  subdivision  (vi),  no holder of
Registrable Securities or underwriter shall be required to contribute any amount
in excess of the  amount  by which (i) in the case of any such  holder,  the net
proceeds received by such holder from the sale of Registrable Securities or (ii)
in the  case of an  underwriter,  the  total  price  at  which  the  Registrable
Securities  purchased  by it and  distributed  to the public were offered to the
public exceeds,  in any such case, the amount of any damages that such holder or
underwriter  has  otherwise  been  required  to pay by reason of such  untrue or
allege   untrue   statement  or  omission.   No  Person   guilty  of  fraudulent
misrepresentation  (within the meaning of Section 11(f) of the  Securities  Act)
shall be  entitled  to  contribution  from any person who was not guilty of such
fraudulent misrepresentation.

     3. Definitions.  As used herein, unless the context otherwise requires, the
following terms have the following respective meanings:

     "Agreement": As defined in Section 1.

     "Amex": As defined in Section 1.

     "Commission":  The Securities and Exchange  Commission or any other Federal
agency at the time administering the Securities Act.

     "Common Stock": As defined in Section 1.

     "Company": As defined in the introductory paragraph of this Agreement.

     "Exchange  Act": The Securities  Exchange Act of 1934, as amended,  and the
rules and regulations of the Commission thereunder.

     "Person": A corporation, association, partnership,  organization, business,
individual,  governmental  or political  subdivision  thereof or a  governmental
agency.

     "Preferred  Stock":  As defined  in  Section  1, such term to  include  any
securities issued in substitution of or in addition to such Preferred Stock.

     "Registrable  Securities":  The  Securities  and any  securities  issued or
issuable with respect to such Securities by way of stock dividend or stock split
or in  connection  with  a  combination  of  shares,  recapitalization,  merger,
consolidation or other reorganization or otherwise.  Once issued such securities
shall cease to be Registrable  Securities when (a) a registration statement with
respect to the sale of such  securities  shall have become  effective  under the
Securities  Act and such  securities  shall have been  disposed of in accordance
with such  registration  statement,  (b) they shall have been distributed to the
public  pursuant to Rule 144 (or any successor  provision)  under the Securities
Act, (c) they shall have been otherwise  transferred,  new certificates for them
not bearing a legend  restricting  further transfer shall have been delivered by
the Company and subsequent disposition of them shall not require registration or
qualification  of them under the Securities Act or any similar state law then in
force,  (d) they shall have ceased to be  outstanding,  (e) on the expiration of
the  applicable  Registration  Maintenance  Period  or (f) any  and all  legends
restricting transfer thereof have been removed in accordance with the provisions
of Rule 144(k) (or any successor provision) under the Securities Act.

     "Registration Expenses": All expenses incident to the Company's performance
of or  compliance  with  this  Agreement,  including,  without  limitation,  all
registration,  filing and NASD fees,  all stock  exchange and Amex listing fees,
all fees and expenses of complying  with  securities or blue sky laws,  all word
processing,  duplicating and printing expenses, messenger and delivery expenses,
the fees and  disbursements  of counsel for the  Company and of its  independent
public  accountants,  including  the  expenses  of any  special  audits or "cold
comfort"  letters  required by or incident to such  performance  and compliance,
premiums  and other  costs of  policies  of  insurance  of the  Company  against
liabilities  arising out of the public  offering of the  Registrable  Securities
being registered and any fees and disbursements of underwriters customarily paid
by issuers or sellers of securities,  but excluding  underwriting  discounts and
commissions  and  transfer  taxes,  if any,  provided  that,  in any case  where
Registration  Expenses are not to be borne by the Company,  such expenses  shall
not include salaries of Company  personnel or general  overhead  expenses of the
Company,  auditing  fees,  premiums  or other  expenses  relating  to  liability
insurance  required by  underwriters  of the Company or other  expenses  for the
preparation  of  financial  statements  or other data  normally  prepared by the
Company in the ordinary  course of its business or which the Company  would have
incurred in any event.

     "Registration Maintenance Period": As defined in Section 2.3.

     "Required Effectiveness Date": As defined in Section 2.1.







     "Securities Act": The Securities Act of 1933, as amended, and the rules and
regulations of the Commission thereunder.

     "Securities Purchase Agreement": As defined in Section 1.

     "Sellers'  Representative":  Global Capital  Advisors,  Ltd. or such Person
designated by Global Capital Advisors, Ltd.

     "Warrant Shares": As defined in Section 1.


     4. Rule 144. The Company shall timely file the reports required to be filed
by it under the  Securities  Act and the Exchange Act (including but not limited
to the reports  under  Sections 13 and 15(d) of the  Exchange Act referred to in
subparagraph (c) of Rule 144 adopted by the Commission under the Securities Act)
and the rules and regulations  adopted by the Commission  thereunder (or, if the
Company is not  required  to file such  reports,  will,  upon the request of any
holder of Registrable Securities, make publicly available other information) and
will take such  further  action as any  holder  of  Registrable  Securities  may
reasonably request,  all to the extent required from time to time to enable such
holder to sell Registrable  Securities without registration under the Securities
Act within the limitation of the  exemptions  provided by (a) Rule 144 under the
Securities  Act,  as such  Rule may be  amended  from  time to time,  or (b) any
similar rule or regulation hereafter adopted by the Commission. Upon the request
of any holder of Registrable Securities, the Company will deliver to such holder
a written  statement as to whether it has complied with the requirements of this
Section 4.

     5.  Amendments  and Waivers.  This Agreement may be amended and the Company
may take  any  action  herein  prohibited,  or omit to  perform  any act  herein
required to be  performed  by it, only if the Company  shall have  obtained  the
written consent to such  amendment,  action or omission to act, of the holder or
holders  of the  sum of  the  51% or  more  of  the  shares  of (i)  Registrable
Securities issued at such time, plus (ii) Registrable  Securities  issuable upon
exercise or conversion of the Securities then constituting derivative securities
(if such Securities were not fully exchanged or converted in full as of the date
such consent if sought).  Each holder of any Registrable  Securities at the time
or  thereafter  outstanding  shall be bound by any  consent  authorized  by this
Section 5, whether or not such Registrable  Securities shall have been marked to
indicate such consent.

     6.  Nominees  for  Beneficial  Owners.  In the event  that any  Registrable
Securities  are  held  by a  nominee  for  the  beneficial  owner  thereof,  the
beneficial owner thereof may, at its election,  be treated as the holder of such
Registrable Securities for purposes of any request or other action by any holder
or  holders  of  Registrable  Securities  pursuant  to  this  Agreement  or  any
determination  of any number of percentage of shares of  Registrable  Securities
held by any holder or holders of  Registrable  Securities  contemplated  by this
Agreement.  If the beneficial owner of any Registrable Securities so elects, the
Company may require  assurances  reasonably  satisfactory  to it of such owner's
beneficial ownership of such Registrable Securities.







     7. Notices.  Except as otherwise  provided in this Agreement,  all notices,
requests and other  communications to any Person provided for hereunder shall be
in writing and shall be given to such  Person (a) in the case of a party  hereto
other than the  Company,  addressed to such party in the manner set forth in the
Securities  Purchase Agreement or at such other address as such party shall have
furnished  to the Company in writing,  or (b) in the case of any other holder of
Registrable Securities,  at the address that such holder shall have furnished to
the Company in writing,  or,  until any such other  holder so  furnishes  to the
Company  an  address,  then to and at the  address  of the last  holder  of such
Registrable  Securities  who has furnished an address to the Company,  or (c) in
the case of the Company,  at the address set forth on the signature page hereto,
to the attention of its President, or at such other address, or to the attention
of such other  officer,  as the Company  shall have  furnished to each holder of
Registrable  Securities at the time  outstanding.  Each such notice,  request or
other communication shall be effective (i) if given by mail, 72 hours after such
communication  is  deposited  in the mails with  first  class  postage  prepaid,
addressed as aforesaid or (ii) if given by any other means  (including,  without
limitation,  by fax or air  courier),  when  delivered at the address  specified
above,  provided  that any such notice,  request or  communication  shall not be
effective until received.

     8.  Assignment.  This  Agreement  shall be  binding  upon and  inure to the
benefit of and be enforceable by the parties hereto. In addition, and whether or
not any  express  assignment  shall  have  been  made,  the  provisions  of this
Agreement which are for the benefit of the parties hereto other than the Company
shall also be for the benefit of and enforceable by any subsequent holder of any
Registrable  Securities.  Each  of the  Holders  of the  Registrable  Securities
agrees,  by accepting any portion of the Registrable  Securities  after the date
hereof,  to the  provisions of this  Agreement  including,  without  limitation,
appointment  of the  Sellers'  Representative  to act on behalf  of such  Holder
pursuant to the terms hereof which such actions  shall be made in the good faith
discretion of the Sellers'  Representative and be binding on all persons for all
purposes.

     9. Descriptive  Headings.  The descriptive headings of the several sections
and  paragraphs of this  Agreement are inserted for reference only and shall not
limit or otherwise affect the meaning hereof.

     10.  GOVERNING  LAW.  THIS  AGREEMENT  SHALL BE  CONSTRUED  AND ENFORCED IN
ACCORDANCE WITH, AND THE RIGHTS OF THE PARTIES SHALL BE GOVERNED BY, THE LAWS OF
THE STATE OF DELAWARE WITHOUT REFERENCE TO THE PRINCIPLES OF CONFLICTS OF LAWS.

     11.  Counterparts.  This  Agreement may be executed by facsimile and may be
signed  simultaneously  in any number of  counterparts,  each of which  shall be
deemed an original,  but all such counterparts shall together constitute one and
the same instrument.

     12.  Entire  Agreement.  Subject  to Article X of the  Securities  Purchase
Agreement,  this  Agreement  embodies  the entire  agreement  and  understanding
between the Company and each other party hereto  relating to the subject  matter
hereof and supersedes all prior agreements and  understandings  relating to such
subject matter.

     13. Severability. If any provision of this Agreement, or the application of
such  provisions  to any  Person or  circumstance,  shall be held  invalid,  the
remainder of this Agreement,  or the application of such provision to Persons or
circumstances  other  than  those  to  which it is held  invalid,  shall  not be
affected thereby.








                            [Signature Page Follows]








         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed and delivered by their respective officers thereunto duly authorized as
of the date first above written.


                                  AVITAR, INC.



                             By:
                                ----------------------------------------------
                             Name:
                                  --------------------------------------------
                             Title:
                                   -------------------------------------------

                              Address: 65 Dan Road
                                       Canton, MA  02021

                              Telephone:  781-821-2440
                              Fax: 781-821-4458
                              Attn:    Peter P. Phildius




                             GCA Strategic Investment Fund Limited



                             By:
                                                        -----------------------
                              Name: Lewis N. Lester
                                 Title: Director

                              Address: Mechanics Building
                                       12 Church Street
                                       Hamilton, Bermuda  HM11

                              Telephone:(678) 947-0028
                              Fax: (678) 947-6499
                              Attn: Lewis N. Lester