EXHIBIT 4.3
                          REGISTRATION RIGHTS AGREEMENT

     This Registration  Rights Agreement (this  "Agreement") is made and entered
into as of August 13, 2003,  by and among Avitar,  Inc., a Delaware  corporation
(the "Company"),  and Gryphon Master Fund,  L.P., a Bermuda limited  partnership
(the "Purchaser").

     WHEREAS,  upon the terms and subject to the  conditions  of the  Securities
Purchase Agreement, dated as of the date hereof (the "Purchase Agreement"),  the
Company has agreed to issue and sell shares of its Preferred  Stock and Warrants
to purchase shares of its Common Stock to the Purchaser; and

     WHEREAS,  to induce the  Purchaser  to execute  and  deliver  the  Purchase
Agreement and to purchase the Shares and the Warrants, the Company has agreed to
provide certain registration rights under the Securities Act of 1933, as amended
(the "Securities  Act"),  with respect to the Conversion  Shares and the Warrant
Shares (each as respectively defined in the Purchase Agreement).

     NOW,  THEREFORE,  in consideration of the  representations,  warranties and
agreements  contained  herein and other  good and  valuable  consideration,  the
receipt and legal adequacy of which are hereby acknowledged by the parties,  the
Company and the Purchaser hereby agree as follows:

1. Definitions.

     Capitalized  terms used but not  otherwise  defined  herein  shall have the
meanings given such terms in the Purchase Agreement.  As used in this Agreement,
the following terms shall have the following meanings:

     "Affiliate"  means,  with  respect to any  Person,  any other  Person  that
directly or indirectly controls or is controlled by or under common control with
such Person.  For the  purposes of this  definition,  "control,"  when used with
respect to any Person, means the possession, direct or indirect, of the power to
direct or cause the  direction  of the  management  and policies of such Person,
whether  through the ownership of voting  securities,  by contract or otherwise;
and  the  terms  "affiliated,"  "controlling"  and  "controlled"  have  meanings
correlative to the foregoing.

     "AMEX" shall mean the American Stock Exchange.

     "Blackout Period" shall have the meaning set forth in Section 3(m).

     "Board" shall have the meaning set forth in Section 3(m).

     "Business Day" means any day except Saturday, Sunday and any day which is a
legal  holiday  or  a  day  on  which  banking  institutions  in  the  state  of
Massachusetts  generally are  authorized or required by law or other  government
actions to close.

     "Commission" means the Securities and Exchange Commission.

     "Common  Shares"  shall have the  meaning  set forth in the  definition  of
"Registrable Securities."

     "Common Stock" means the Company's Common Stock, $.01 par value.

     "Effectiveness  Date" means with respect to the Registration  Statement the
earlier of (i) the 90th day following the Closing Date, before which the Company
will  use its best  efforts  to  cause  the  Registration  Statement  to  become
effective,  and (ii) the date which is within five (5) Business Days of the date
on which the  Commission  informs the Company that the  Commission  (a) will not
review the  Registration  Statement  or (b) that the  Company  may  request  the
acceleration of the effectiveness of the Registration Statement.

     "Effectiveness Period" shall have the meaning set forth in Section 2.

     "Event" shall have the meaning set forth in Section 8(d).

     "Exchange Act" means the Securities Exchange Act of 1934, as amended.

     "Filing Date" means the date that the Registration Statement is required to
be filed which date shall be within thirty (30) days from the Closing Date.

     "Holder" means, collectively,  each holder from time to time of Registrable
Securities including,  without limitation,  the Purchaser and its assignees.  To
the extent this Agreement  refers to an election,  consent,  waiver,  request or
approval of or by a Holder,  such  reference  shall mean an  election,  consent,
waiver,  request or  approval  by the  holders of a majority  in interest of the
then-outstanding Registrable Securities (on an as converted basis).

     "Indemnified Party" shall have the meaning set forth in Section 6(c).

     "Indemnifying Party" shall have the meaning set forth in Section 6(c).

     "Liquidated Damages" shall have the meaning set forth in Section 8(d).

     "Losses" shall have the meaning set forth in Section 6(a).

     "Person"  means  an  individual  or  a  corporation,   partnership,  trust,
incorporated or  unincorporated  association,  joint venture,  limited liability
company, joint stock company,  government (or an agency or political subdivision
thereof) or other entity of any kind.

     "Preferred  Stock" means the  Company's  8%  Convertible  Preferred  Stock,
$0.001 par value.

     "Proceeding"  means an action,  claim,  suit,  investigation  or proceeding
(including,  without limitation, an investigation or partial proceeding, such as
a deposition), whether commenced or threatened.

     "Prospectus"  means the prospectus  included in the Registration  Statement
(including,  without  limitation,  a prospectus  that  includes any  information
previously omitted from a prospectus filed as part of an effective  registration
statement in reliance upon Rule 430A  promulgated  under the Securities Act), as
amended or supplemented by any prospectus supplement,  with respect to the terms
of the  offering of any  portion of the  Registrable  Securities  covered by the
Registration  Statement,  and  all  other  amendments  and  supplements  to  the
Prospectus,  including post-effective  amendments, and all material incorporated
by reference in such Prospectus.

     "Registrable  Securities"  means  the  shares of Common  Stock  issued  and
issuable  pursuant to the conversion of the Preferred  Stock and the exercise of
the  Warrants,  as the case may be, and upon any stock  split,  stock  dividend,
recapitalization  or similar  event with  respect to such shares of Common Stock
and any other securities  issued in exchange of or replacement of such shares of
Common Stock  (collectively,  the "Common Shares");  until in the case of any of
the Common Shares (a) a  Registration  Statement  covering such Common Share has
been declared  effective by the Commission and continues to be effective  during
the  Effectiveness  Period,  or (b) such Common Share is sold in compliance with
Rule 144 or may be sold  pursuant to Rule  144(k),  after which time such Common
Share shall not be a Registrable Security.

     "Registration  Statement" means the registration  statement,  including the
Prospectus,  amendments  and  supplements  to  such  registration  statement  or
Prospectus,  including pre- and post-effective amendments, all exhibits thereto,
and all material incorporated by reference in such registration  statement,  for
the Shares,  the Conversion Shares, the Warrants and the Warrant Shares required
to be filed by the Company with the Commission pursuant to this Agreement.

     "Rule 144" means Rule 144  promulgated  by the  Commission  pursuant to the
Securities  Act, as such Rule may be amended  from time to time,  or any similar
rule or regulation  hereafter adopted by the Commission having substantially the
same effect as such Rule.

     "Rule 158" means Rule 158  promulgated  by the  Commission  pursuant to the
Securities  Act, as such Rule may be amended  from time to time,  or any similar
rule or regulation  hereafter adopted by the Commission having substantially the
same effect as such Rule.

     "Rule 415" means Rule 415  promulgated  by the  Commission  pursuant to the
Securities  Act, as such Rule may be amended  from time to time,  or any similar
rule or regulation  hereafter adopted by the Commission having substantially the
same effect as such Rule.

     "Securities Act" means the Securities Act of 1933, as amended.

     "Special  Counsel"  means any special  counsel to Holder,  for which Holder
will be  reimbursed by the Company  pursuant to Section 5 of this  Agreement and
Section 8.1 of the Purchase Agreement.

2.  Registration.  On or prior to the Filing Date, the Company shall prepare and
file with the  Commission a  Registration  Statement  covering the resale of the
Registrable Securities for an offering to be made on a continuous basis pursuant
to Rule 415.  The  Registration  Statement  shall be on Form S-3  (except if the
Company is not then eligible to register for resale the  Registrable  Securities
on Form S-3,  in which case such  registration  shall be on another  appropriate
form in accordance with the Securities Act and the rules promulgated thereunder)
and shall contain  (except if otherwise  directed by the Purchaser) the "Plan of
Distribution"  attached  hereto as Exhibit B. The Company hereby  represents and
warrants that it is currently eligible to use Form S-3 to register the resale of
the  Registrable  Securities.  The Company  shall (i) not permit any  securities
other  than  the  Registrable  Securities  to be  included  in the  Registration
Statement,  (ii) use its best efforts to cause the Registration  Statement to be
declared   effective  under  the  Securities  Act  (including  filing  with  the
Commission a request for  acceleration of  effectiveness in accordance with Rule
12dl-2  promulgated  under the Exchange Act within five (5) Business Days of the
date that the Company is notified  (orally or in writing,  whichever is earlier)
by the Commission  that a Registration  Statement will not be "reviewed," or not
be subject to further review) as soon as possible after the filing thereof,  but
in any event prior to the  Effectiveness  Date, and (iii) keep such Registration
Statement  continuously  effective  under the Securities Act for a period of two
years from the Effectiveness Date (the "Effectiveness Period").

3. Registration Procedures; Company's Obligations.

     In connection  with the  registration of the  Registrable  Securities,  the
Company shall:

     (a) Prepare and file with the  Commission on or prior to the Filing Date, a
Registration  Statement  on Form S-3 (or if the Company is not then  eligible to
register for resale the  Registrable  Securities  on Form S-3 such  registration
shall be on another  appropriate  form in accordance with the Securities Act and
the Rules  promulgated  thereunder) in accordance  with the method or methods of
distribution thereof as specified by the Holder (except if otherwise directed by
the  Holder),  and use its best efforts to cause the  Registration  Statement to
become  effective and remain effective as provided  herein;  provided,  however,
that  not  less  than  three  (3)  Business  Days  prior  to the  filing  of the
Registration  Statement or any related Prospectus or any amendment or supplement
thereto (including any document that would be incorporated therein by reference,
but after  effectiveness,  excluding  any  document  that would be  incorporated
therein  by  reference),  the  Company  shall (i)  furnish to the Holder and any
Special  Counsel,  copies of all such  documents  proposed  to be  filed,  which
documents  (other than those  incorporated  by reference) will be subject to the
timely review of and comment by such Special Counsel, and (ii) at the request of
the Holder cause its officers and directors,  counsel and independent  certified
public  accountants to respond to such  inquiries as shall be necessary,  in the
reasonable   opinion  of  such   Special   Counsel,   to  conduct  a  reasonable
investigation  within the meaning of the  Securities  Act. The Company shall not
file the  Registration  Statement or any such  Prospectus  or any  amendments or
supplements  thereto to which the Holder or any Special Counsel shall reasonably
object in writing within three (3) Business Days of their receipt thereof.

     (b) (i) Prepare and file with the  Commission  such  amendments,  including
post-effective  amendments, to the Registration Statement as may be necessary to
keep the  Registration  Statement  continuously  effective as to the  applicable
Registrable  Securities  for the  Effectiveness  Period in order to register for
resale under the Securities Act all of the  Registrable  Securities;  (ii) cause
the related Prospectus to be amended or supplemented by any required  Prospectus
supplement,  and as so  supplemented or amended to be filed pursuant to Rule 424
(or any similar  provisions then in force) promulgated under the Securities Act;
(iii) respond promptly to any comments received from the Commission with respect
to the Registration  Statement or any amendment thereto and promptly provide the
Holder true and complete copies of all correspondence from and to the Commission
relating to the Registration Statement; and (iv) comply in all material respects
with the  provisions of the  Securities Act and the Exchange Act with respect to
the  disposition  of all  Registrable  Securities  covered  by the  Registration
Statement  during the applicable  period in accordance with the intended methods
of  disposition  by the Holder  set forth in the  Registration  Statement  as so
amended or in such Prospectus as so supplemented.

     (c) Notify the Holder of Registrable  Securities to be sold and any Special
Counsel  promptly  (and,  in the case of (i)(A)  below,  not less than three (3)
Business  Days prior to such filing and, in the case of (i)(B) or (i)(C)  below,
no  later  than  the  first  Business  Day  following  the  date  on  which  the
Registration  Statement becomes effective) and (if requested by any such Person)
confirm such notice in writing no later than three (3) Business  Days  following
the day (i)(A) when a Prospectus or any Prospectus  supplement or post-effective
amendment to the  Registration  Statement is proposed to be filed,  (B) when the
Commission  notifies  the  Company  whether  there  will be a  "review"  of such
Registration  Statement and whenever the Commission  comments in writing on such
Registration  Statement,  and (C) with respect to the Registration  Statement or
any post-effective  amendment,  when the same has become effective;  (ii) of any
request by the Commission or any other Federal or state  governmental  authority
for amendments or supplements to the Registration Statement or Prospectus or for
additional  information;  (iii) of the  issuance by the  Commission  of any stop
order suspending the effectiveness of the Registration Statement covering any or
all of the Registrable  Securities or the initiation of any Proceedings for that
purpose;  (iv) of the receipt by the Company of any notification with respect to
the suspension of the  qualification  or exemption from  qualification of any of
the Registrable  Securities for sale in any  jurisdiction,  or the initiation or
threatening of any Proceeding for such purpose; and (v) of the occurrence of any
event that makes any statement made in the Registration  Statement or Prospectus
or any document  incorporated or deemed to be incorporated  therein by reference
untrue  in  any  material   respect  or  that  requires  any  revisions  to  the
Registration  Statement,  Prospectus or other  documents so that, in the case of
the  Registration  Statement or the Prospectus,  as the case may be, it will not
contain any untrue  statement  of a material  fact or omit to state any material
fact required to be stated therein or necessary to make the statements  therein,
in the light of the circumstances under which they were made, not misleading.

     The Company shall promptly furnish to the Special Counsel,  without charge,
(i) any  correspondence  from the  Commission or the  Commission's  staff to the
Company or its representatives  relating to any Registration Statement, and (ii)
promptly after the same is prepared and filed with the Commission, a copy of any
written response to the correspondence received from the Commission.

     (d) Use its best efforts to avoid the  issuance  of, or, if issued,  obtain
the  withdrawal  of,  (i)  any  order   suspending  the   effectiveness  of  the
Registration  Statement,  or  (ii)  any  suspension  of  the  qualification  (or
exemption from  qualification) of any of the Registrable  Securities for sale in
any U.S. jurisdiction, at the earliest practicable moment.

     (e) If requested by the Holder,  (i) promptly  incorporate  in a Prospectus
supplement  or  post-effective  amendment  to the  Registration  Statement  such
information as the Company  reasonably  agrees should be included  therein,  and
(ii)  make  all  required   filings  of  such  Prospectus   supplement  or  such
post-effective  amendment as soon as practicable  after the Company has received
notification of the matters to be incorporated in such Prospectus  supplement or
post-effective amendment.

     (f) Furnish to the Holder and any Special Counsel, without charge, at least
one conformed copy of each  Registration  Statement and each amendment  thereto,
including  financial  statements and schedules,  all documents  incorporated  or
deemed to be incorporated  therein by reference,  and all exhibits to the extent
requested by such Person  (including those previously  furnished or incorporated
by reference) promptly after the filing of such documents with the Commission.

     (g) Promptly deliver to the Holder and any Special Counsel, without charge,
as  many  copies  of the  Registration  Statement,  Prospectus  or  Prospectuses
(including each form of prospectus) and each amendment or supplement  thereto as
such Persons may reasonably request;  and the Company hereby consents to the use
of such  Prospectus  and each  amendment  or  supplement  thereto by the selling
Holder in connection  with the offering and sale of the  Registrable  Securities
covered by such Prospectus and any amendment or supplement thereto.

     (h) Prior to any public  offering of Registrable  Securities,  use its best
efforts to register  or qualify or  cooperate  with the  selling  Holder and any
Special  Counsel  in  connection  with the  registration  or  qualification  (or
exemption  from  such   registration  or   qualification)  of  such  Registrable
Securities  for offer and sale  under  the  securities  or Blue Sky laws of such
jurisdictions  within the United  States as the Holder  reasonably  requests  in
writing,   to  keep  each  such  registration  or  qualification  (or  exemption
therefrom) effective during the Effectiveness Period and to do any and all other
acts or  things  necessary  or  advisable  to  enable  the  disposition  in such
jurisdictions of the Registrable Securities covered by a Registration Statement;
provided,  however,  that the Company shall not be required to qualify generally
to do business in any jurisdiction  where it is not then so qualified or to take
any  action  that would  subject  it to  general  service of process in any such
jurisdiction  where it is not then so subject or subject  the Company to any tax
in any such jurisdiction where it is not then so subject.

     (i) Cooperate  with the Holder to  facilitate  the timely  preparation  and
delivery of certificates representing Registrable Securities to be sold pursuant
to a Registration  Statement and to enable such Registrable  Securities to be in
such  denominations  and  registered  in such names as the Holder may request at
least two (2) Business Days prior to any sale of Registrable Securities.

     (j) Upon the  occurrence  of any event  contemplated  by  Section  3(c)(v),
promptly   prepare  a  supplement  or  amendment,   including  a  post-effective
amendment,  to  the  Registration  Statement  or a  supplement  to  the  related
Prospectus or any document  incorporated or deemed to be incorporated therein by
reference,  and  file  any  other  required  document  so  that,  as  thereafter
delivered,  neither the Registration  Statement nor such Prospectus will contain
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,  in the light
of the circumstances under which they were made, not misleading.

     (k) Use its best efforts to cause all  Registrable  Securities  relating to
such  Registration  Statement to be listed on the AMEX and any other  securities
exchange,  quotation system, market or over-the-counter  bulletin board, if any,
on which the same  securities  issued by the Company are then listed as and when
required pursuant to the Purchase Agreement.

     (l)  Comply  in  all  material  respects  with  all  applicable  rules  and
regulations  of the  Commission  and make  generally  available  to its security
holders  earning  statements  satisfying  the provisions of Section 11(a) of the
Securities Act and Rule 158 not later than forty-five (45) days after the end of
any twelve  (12) month  period (or ninety  (90) days after the end of any twelve
(12) month period if such period is a fiscal year)  commencing  on the first day
of the first  fiscal  quarter of the  Company  after the  effective  date of the
Registration  Statement,  which statement  shall conform to the  requirements of
Rule 158.

     (m) If (i) there is material non-public  information  regarding the Company
which the Company's Board of Directors (the "Board")  reasonably  determines not
to be in the  Company's  best  interest to disclose and which the Company is not
otherwise  required  to  disclose,  or  (ii)  there  is a  significant  business
opportunity  (including,  but not limited to, the  acquisition or disposition of
assets  (other  than  in  the  ordinary  course  of  business)  or  any  merger,
consolidation,  tender  offer or other  similar  transaction)  available  to the
Company which the Board  reasonably  determines  not to be in the Company's best
interest to disclose and which the Company  would be required to disclose  under
the  Registration  Statement,  then the Company may suspend  effectiveness  of a
Registration  Statement and suspend the sale of Registrable  Securities  under a
Registration Statement one (1) time every three (3) months or three (3) times in
any  twelve  month  period,  provided  that  the  Company  may not  suspend  its
obligation  for more than thirty (30) days in the  aggregate in any twelve month
period if suspension  is for any of the reasons  listed above or sixty (60) days
in the  aggregate  in any twelve  month  period for any other  reason  (each,  a
"Blackout  Period");  provided,  however,  that  no  such  suspension  shall  be
permitted for more than twenty (20)  consecutive  days,  arising out of the same
set of facts, circumstances or transactions.

     (n) Within two (2) Business  Days after the  Registration  Statement  which
includes the Registrable Securities is ordered effective by the Commission,  the
Company shall deliver, and shall cause legal counsel for the Company to deliver,
to the transfer agent for such Registrable Securities (with copies to the Holder
whose  Registrable  Securities  are  included  in such  Registration  Statement)
confirmation that the Registration  Statement has been declared effective by the
Commission in the form attached hereto as Exhibit C.

     (o) Use its best  efforts to prevent all  Affiliates  of the  Company  from
selling or otherwise  disposing  of any Common Stock prior to the  Effectiveness
Date.

4. Registration Procedures; Holder's Obligations

     In connection  with the  registration of the  Registrable  Securities,  the
Holder shall:

     (a) If the Registration Statement refers to the Holder by name or otherwise
as the holder of any  securities  of the Company,  have the right to require (if
such  reference  to the  Holder  by name or  otherwise  is not  required  by the
Securities Act or any similar federal statute then in force) the deletion of the
reference  to the Holder in any  amendment  or  supplement  to the  Registration
Statement filed or prepared subsequent to the time that such reference ceases to
be required.

     (b)  (i)  not  sell  any  Registrable  Securities  under  the  Registration
Statement  until it has  received  copies of the  Prospectus  as then amended or
supplemented  as  contemplated  in Section 3(g) and notice from the Company that
such  Registration  Statement  and any  post-effective  amendments  thereto have
become  effective  as  contemplated  by  Section  3(c),  (ii)  comply  with  the
prospectus  delivery  requirements  of the Securities Act as applicable to it in
connection  with sales of Registrable  Securities  pursuant to the  Registration
Statement,  and (iii) furnish to the Company  information  regarding such Holder
and the distribution of such Registrable  Securities as is required by law to be
disclosed in the Registration  Statement,  and the Company may exclude from such
registration  the  Registrable  Securities  of the Holder if it fails to furnish
such  information  within  a  reasonable  time  prior  to  the  filing  of  each
Registration  Statement,  supplemented  Prospectus  and/or amended  Registration
Statement.

     (c) upon  receipt of a notice  from the  Company of the  occurrence  of any
event of the kind described in Section 3(c)(ii), 3(c)(iii), 3(c)(iv), 3(c)(v) or
3(m), forthwith discontinue disposition of such Registrable Securities under the
Registration  Statement  until  the  Holder's  receipt  of  the  copies  of  the
supplemented  Prospectus and/or amended Registration  Statement  contemplated by
Section  3(j),  or until it is advised in writing by the Company that the use of
the  applicable  Prospectus  may be resumed,  and, in either case,  has received
copies of any additional or supplemental filings that are incorporated or deemed
to be incorporated by reference in such Prospectus or Registration Statement.

5. Registration Expenses

     All  reasonable  fees  and  expenses  incident  to  the  performance  of or
compliance  with this  Agreement  by the  Company  shall be borne by the Company
whether or not the  Registration  Statement  is filed or becomes  effective  and
whether or not any Registrable  Securities are sold pursuant to the Registration
Statement.  The fees and expenses  referred to in the foregoing  sentence  shall
include, without limitation, the following: (i) all registration and filing fees
(including,  without  limitation,  fees and expenses (A) with respect to filings
required to be made with the AMEX and each other  securities  exchange or market
on which Registrable  Securities are required  hereunder to be listed,  (B) with
respect  to  filings  required  to be  made  with  the  Commission,  and  (C) in
compliance  with state  securities  or Blue Sky laws);  (ii)  printing  expenses
(including,   without   limitation,   expenses  of  printing   certificates  for
Registrable   Securities  and  of  printing  prospectuses  if  the  printing  of
prospectuses  is  requested  by the  holders  of a majority  of the  Registrable
Securities included in the Registration Statement);  (iii) messenger,  telephone
and delivery  expenses;  (iv) fees and disbursements of counsel for the Company;
and (v) fees and  expenses  of all other  Persons  retained  by the  Company  in
connection  with  the  consummation  of the  transactions  contemplated  by this
Agreement,  including,  without  limitation,  the Company's  independent  public
accountants  (including the expenses of any comfort letters or costs  associated
with the  delivery by  independent  public  accountants  of a comfort  letter or
comfort letters).  In addition,  the Company shall be responsible for all of its
internal   expenses   incurred  in  connection  with  the  consummation  of  the
transactions contemplated by this Agreement (including,  without limitation, all
salaries  and  expenses  of its  officers  and  employees  performing  legal  or
accounting  duties),  the expense of any annual audit, and the fees and expenses
incurred in  connection  with the listing of the  Registrable  Securities on any
securities exchange as required hereunder.

     6. Indemnification

     (a) Indemnification by the Company. The Company shall,  notwithstanding any
termination of this  Agreement,  indemnify and hold harmless the Purchaser,  its
permitted assignees, officers, directors, agents, brokers (including brokers who
offer and sell  Registrable  Securities  as principal as a result of a pledge or
any failure to perform under a margin call of Common Stock), investment advisors
and employees,  each Person who controls any the Purchaser or permitted assignee
(within  the  meaning of Section 15 of the  Securities  Act or Section 20 of the
Exchange  Act) and the  officers,  directors,  agents and employees of each such
controlling Person, and the respective successors,  assigns, estate and personal
representatives  of each of the foregoing,  to the fullest  extent  permitted by
applicable  law,  from  and  against  any  and  all  claims,  losses,   damages,
liabilities,  penalties,  judgments, costs (including, without limitation, costs
of  investigation)  and  expenses  (including,  without  limitation,  reasonable
attorneys' fees and expenses) (collectively, "Losses"), as incurred, arising out
of or  relating to any untrue or alleged  untrue  statement  of a material  fact
contained in the  Registration  Statement,  any  Prospectus,  as supplemented or
amended, if applicable, or arising out of or relating to any omission or alleged
omission of a material fact  required to be stated  therein or necessary to make
the  statements  therein (in the case of any Prospectus or form of prospectus or
supplement  thereto,  in the light of the  circumstances  under  which they were
made) not  misleading,  except (i) to the extent,  but only to the extent,  that
such untrue statements or omissions are based solely upon information  regarding
the Holder  furnished in writing to the Company by the Holder  expressly for use
therein,  which information was reviewed and expressly approved by the Holder or
Special Counsel expressly for use in the Registration Statement, such Prospectus
or such form of Prospectus or in any amendment or supplement thereto, or (ii) as
a result of the  failure of the Holder to  deliver a  Prospectus,  as amended or
supplemented,  to the Purchaser in connection with an offer or sale. The Company
shall notify the Holder promptly of the institution,  threat or assertion of any
Proceeding  of which the Company is aware in  connection  with the  transactions
contemplated  by this  Agreement.  Such indemnity shall remain in full force and
effect  regardless of any  investigation  made by or on behalf of an Indemnified
Party (as defined in Section 6(c) hereof) and shall  survive the transfer of the
Registrable Securities by the Holder.

     (b)  Indemnification  by the Purchaser.  The Purchaser  shall indemnify and
hold harmless the Company, its directors,  officers,  agents and employees, each
Person  who  controls  the  Company  (within  the  meaning  of Section 15 of the
Securities Act and Section 20 of the Exchange Act), and the directors, officers,
agents or employees of such controlling Persons, and the respective  successors,
assigns,  estate and personal  representatives of each of the foregoing,  to the
fullest extent permitted by applicable law, from and against any and all Losses,
as  incurred,  arising  out of or  relating  to any  untrue  or  alleged  untrue
statement  of a material  fact  contained  in the  Registration  Statement,  any
Prospectus,  as  supplemented  or amended,  if applicable,  or arising out of or
relating to any omission or alleged  omission of a material  fact required to be
stated therein or necessary to make the  statements  therein (in the case of any
Prospectus  or form of prospectus  or  supplement  thereto,  in the light of the
circumstances  under which they were made) not  misleading,  to the extent,  but
only to the extent,  that (i) such untrue  statement or omission is contained in
or omitted  from any  information  so  furnished in writing by the Holder or the
Special Counsel to the Company  specifically  for inclusion in the  Registration
Statement or such Prospectus,  and (ii) such  information was reasonably  relied
upon by the Company for use in the  Registration  Statement,  such Prospectus or
such form of prospectus or, to the extent that such  information  relates to the
Holder  or  the  Holder's   proposed   method  of  distribution  of  Registrable
Securities,  was  reviewed  and  expressly  approved  in  writing  by the Holder
expressly for use in the Registration Statement, such Prospectus or such form of
Prospectus  Supplement.  Notwithstanding  anything  to  the  contrary  contained
herein,  the Holder shall be liable under this Section 6(b) for only that amount
as does not  exceed  the net  proceeds  to the Holder as a result of the sale of
Registrable Securities pursuant to such Registration Statement.

     (c) Conduct of  Indemnification  Proceedings.  If any  Proceeding  shall be
brought or asserted against any Person entitled to indemnity pursuant to Section
6(a) or 6(b) hereunder (an "Indemnified Party"), such Indemnified Party promptly
shall notify the Person from whom indemnity is sought (the "Indemnifying  Party)
in  writing,  and the  Indemnifying  Party  shall  assume the  defense  thereof,
including the employment of counsel  reasonably  satisfactory to the Indemnified
Party and the  payment of all fees and  expenses  incurred  in  connection  with
defense  thereof;  provided,  that the failure of any Indemnified  Party to give
such notice  shall not  relieve the  Indemnifying  Party of its  obligations  or
liabilities pursuant to this Agreement,  except (and only) to the extent that it
shall  be  finally  determined  by a  court  of  competent  jurisdiction  (which
determination  is not  subject to appeal or further  review)  that such  failure
shall have materially and adversely prejudiced the Indemnifying Party.

     An Indemnified Party shall have the right to employ separate counsel in any
such  Proceeding  and to participate  in the defense  thereof,  but the fees and
expenses of such counsel  shall be at the expense of such  Indemnified  Party or
Parties  unless:  (i) the  Indemnifying  Party has agreed in writing to pay such
fees and expenses;  or (ii) the Indemnifying Party shall have failed promptly to
assume  the  defense  of  such  Proceeding  and  to  employ  counsel  reasonably
satisfactory  to such  Indemnified  Party in any such  Proceeding;  or (iii) the
named parties to any such Proceeding  (including any impleaded  parties) include
both such  Indemnified  Party and the  Indemnifying  Party, and such Indemnified
Party shall have been  advised by counsel  that a conflict of interest is likely
to exist if the same counsel were to represent  such  Indemnified  Party and the
Indemnifying  Party (in which  case,  if such  Indemnified  Party  notifies  the
Indemnifying  Party in writing that it elects to employ separate  counsel at the
expense of the Indemnifying  Party,  the  Indemnifying  Party shall not have the
right to assume the defense  thereof and such counsel shall be at the expense of
the  Indemnifying  Party).  The  Indemnifying  Party shall not be liable for any
settlement of any such Proceeding  effected without its written  consent,  which
consent  shall  not  be  unreasonably  withheld,   conditioned  or  delayed.  No
Indemnifying  Party shall,  without the prior written consent of the Indemnified
Party, which consent shall not unreasonably be withheld, conditioned or delayed,
effect  any  settlement  of any  pending  Proceeding  in  respect  of which  any
Indemnified Party is a party,  unless such settlement  includes an unconditional
release of such  Indemnified  Party from all  liability  on claims  that are the
subject matter of such Proceeding.

     All  reasonable  fees and  expenses  of the  Indemnified  Party  (including
reasonable  fees  and  expenses  to  the  extent  incurred  in  connection  with
investigating   or  preparing  to  defend  such   Proceeding  in  a  manner  not
inconsistent  with this  Section)  shall be paid to the  Indemnified  Party,  as
incurred,  within  ten (10)  Business  Days of  written  notice  thereof  to the
Indemnifying  Party  (regardless of whether it is ultimately  determined that an
Indemnified Party is not entitled to indemnification  hereunder;  provided, that
the  Indemnifying  Party may require  such  Indemnified  Party to  undertake  to
reimburse  all such fees and  expenses  to the extent it is  finally  judicially
determined  that  such  Indemnified  Party is not  entitled  to  indemnification
hereunder or pursuant to applicable law).

     (d) Contribution. If a claim for indemnification under Section 6(a) or 6(b)
is  unavailable  to an  Indemnified  Party  because of a failure or refusal of a
governmental  authority to enforce such  indemnification  in accordance with its
terms (by reason of public policy or otherwise),  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 Losses,  in such
proportion as is appropriate  to reflect the relative fault of the  Indemnifying
Party and  Indemnified  Party in  connection  with the  actions,  statements  or
omissions that resulted in such Losses as well as any other  relevant  equitable
considerations.  The relative fault of such  Indemnifying  Party and Indemnified
Party shall be  determined  by  reference  to, among other  things,  whether any
action in  question,  including  any untrue or  alleged  untrue  statement  of a
material fact or omission or alleged omission of a material fact, has been taken
or made by, or relates to information  supplied by, such  Indemnifying  Party or
Indemnified  Party,  and the  parties'  relative  intent,  knowledge,  access to
information  and  opportunity  to correct or prevent such  action,  statement or
omission.  The amount paid or payable by a party as a result of any Losses shall
be deemed to include,  subject to the limitations set forth in Section 6(c), any
reasonable  attorneys'  or other  reasonable  fees or expenses  incurred by such
party in connection with any Proceeding to the extent such party would have been
indemnified for such fees or expenses if the indemnification  provided for under
Section 6(a) or 6(b) was available to such party in  accordance  with its terms.
Notwithstanding  anything to the contrary  contained herein, the Holder shall be
liable or required to contribute under this Section 6(d) for only that amount as
does not  exceed  the net  proceeds  to the  Holder  as a result  of the sale of
Registrable Securities pursuant to the Registration Statement.

     The  parties  hereto  agree  that it  would  not be just and  equitable  if
contribution  pursuant  to  this  Section  6(d)  were  determined  by  pro  rata
allocation or by any other method of allocation  that does not take into account
the equitable considerations referred to in the immediately preceding paragraph.
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.

     The indemnity and contribution  agreements contained in this Section are in
addition  to any  liability  that  the  Indemnifying  Parties  may  have  to the
Indemnified Parties.

     7. Rule 144.

     As long as the Holder owns Registrable Securities, the Company covenants to
timely  file (or  obtain  extensions  in  respect  thereof  and file  within the
applicable  grace period) all reports  required to be filed by the Company after
the date hereof  pursuant to Section  13(a) or 15(d) of the  Exchange Act and to
promptly  furnish the Holder with true and complete  copies of all such filings.
As long  as the  Holder  owns  Registrable  Securities,  if the  Company  is not
required to file reports pursuant to Section 13(a) or 15(d) of the Exchange Act,
it will  prepare  and  furnish  to the  Holder and make  publicly  available  in
accordance  with Rule 144(c)  promulgated  under the  Securities  Act annual and
quarterly financial statements,  together with a discussion and analysis of such
financial statements in form and substance  substantially  similar to those that
would otherwise be required to be included in reports  required by Section 13(a)
or 15(d) of the Exchange Act, as well as any other information required thereby,
in the time period that such filings  would have been required to have been made
under the Exchange  Act. The Company  further  covenants  that it will take such
further action as the Holder may reasonably request,  all to the extent required
from  time  to  time  to  enable  the  Holder  to  sell  Common  Shares  without
registration  under the  Securities  Act within the limitation of the exemptions
provided by Rule 144 promulgated under the Securities Act,  including  providing
any legal  opinions  of  counsel  to the  Company  referred  to in the  Purchase
Agreement.  Upon the request of any Holder,  the Company  shall  deliver to such
Holder a written certification of a duly authorized officer as to whether it has
complied with such requirements.

     8. Miscellaneous.

     (a)  Remedies.  The remedies  provided in this  Agreement  and the Purchase
Agreement are cumulative  and not exclusive of any remedies  provided by law. In
the  event  of a  breach  by the  Company  or by  the  Holder  of  any of  their
obligations under this Agreement, the Holder or the Company, as the case may be,
in addition to being  entitled to exercise  all rights  granted by law and under
this  Agreement,  including  recovery of  damages,  will be entitled to specific
performance of its rights under this Agreement. The Company and the Holder agree
that monetary  damages would not provide  adequate  compensation  for any losses
incurred by reason of a breach by it of any of the  provisions of this Agreement
and  hereby  further  agrees  that,  in the  event of any  action  for  specific
performance in respect of such breach,  it shall waive the defense that a remedy
at law would be adequate.

     (b)  No  Inconsistent  Agreements.  Neither  the  Company  nor  any  of its
Affiliates  has as of the date hereof entered into, nor shall the Company or any
of its  Affiliates,  on or after the date of this  Agreement,  enter  into,  any
agreement with respect to its securities  that is  inconsistent  with the rights
granted  to the  Holder  in this  Agreement  or  otherwise  conflicts  with  the
provisions hereof. Without limiting the generality of the foregoing, without the
written  consent of the Holder,  the  Company  shall not grant to any Person the
right to request the Company to register any securities of the Company under the
Securities Act if the rights so granted are inconsistent with the rights granted
to the Holder set forth herein,  or otherwise prevent the Company with complying
with all of its obligations hereunder.

     (c) No  Piggyback  on  Registrations.  Neither  the  Company nor any of its
security  holders (other than the Holder in such capacity  pursuant hereto or as
the Company  notifies  Purchaser  in writing  prior to the  Closing) may include
securities of the Company in the Registration Statement.

     (d) Failure to File  Registration  Statement and Other Events.  The Company
and the Holder  agree that the Holder  will suffer  damages if the  Registration
Statement  is not  filed  on or  prior  to the  Filing  Date or is not  declared
effective by the Commission on or prior to the Effectiveness Date and maintained
in the manner contemplated herein during the Effectiveness  Period or if certain
other events occur.  The Company and the Holder  further agree that it would not
be feasible to ascertain the extent of such damages with precision. Accordingly,
if (i) the  Registration  Statement is not filed on or prior to the Filing Date,
or is not declared  effective by the Commission on or prior to the Effectiveness
Date,  or (ii) the  Company  fails to file with the  Commission  a  request  for
acceleration in accordance with Rule 12dl-2  promulgated  under the Exchange Act
within five (5) Business  Days of the date that the Company is notified  (orally
or in  writing,  whichever  is earlier) by the  Commission  that a  Registration
Statement will not be "reviewed," or not subject to further review, or (iii) the
Registration  Statement is filed with and declared  effective by the  Commission
but  thereafter  ceases  to be  effective  or  available  as to all  Registrable
Securities at any time during the Effectiveness Period,  without being succeeded
within a reasonable period by a subsequent Registration Statement filed with and
declared  effective by the Commission,  or (iv) the Company  suspends the use of
the  Prospectus  forming  a part of such  Registration  Statement  for more than
thirty (30) days in any period of 365 consecutive  days if the Company  suspends
in reliance on its ability to do so due to the existence of a development  that,
in the good faith discretion of the Board, makes it appropriate to so suspend or
which renders the Company unable to comply with the Commission requirements,  or
the  Company  suspends  the  use of  the  Prospectus  forming  a  part  of  such
Registration  Statement  for more  than  sixty  (60)  days in any  period of 365
consecutive days for any other reason, or (v) during the  Effectiveness  Period,
trading  in the Common  Stock  shall be  suspended  for any reason for more than
three (3)  Business  Days in the  aggregate,  or (vi) the Company  breaches in a
material  respect  any  covenant  or other  material  term or  condition  in the
Transaction  Documents  (other  than  a  representation  or  warranty  contained
therein)  or any other  agreement,  document,  certificate  or other  instrument
delivered in connection with the transactions  contemplated  hereby and thereby,
and such breach  continues for a period of thirty (30) days after written notice
thereof to the Company,  or (vii) the Company has breached  Section 3(n) of this
Agreement  (any such  failure or breach being  referred to as an  "Event"),  the
Company shall pay as liquidated  damages for such failure or breach and not as a
penalty (the "Liquidated  Damages") to the Holder an amount equal to two percent
(2%) of the  purchase  price of the  Preferred  Stock and  Warrants  paid by the
Holder pursuant to the Purchase  Agreement for each thirty (30) day period,  pro
rated for any period less than thirty (30) days,  following  the Event until the
applicable  Event has been cured.  Notwithstanding  the  foregoing,  in no event
shall the Company be required to pay  aggregate  Liquidated  Damages  under this
Section  8(d) in  excess  of ten  percent  (10%)  of the  purchase  price of the
Preferred  Stock  and  Warrants  paid by the  Holder  pursuant  to the  Purchase
Agreement.  Payments to be made  pursuant to this  Section 8(d) shall be due and
payable  immediately  upon demand in cash. The parties agree that the Liquidated
Damages  represent a reasonable  estimate on the part of the parties,  as of the
date of this  Agreement,  of the amount of damages  that may be  incurred by the
Holder if the Registration Statement is not filed on or prior to the Filing Date
or has  not  been  declared  effective  by the  Commission  on or  prior  to the
Effectiveness Date and maintained in the manner  contemplated  herein during the
Effectiveness Period or if any other Event as described herein has occurred.

     (e) Consent to Jurisdiction.  Both the Company and the Purchaser (i) hereby
irrevocably  submit to the  jurisdiction of the United States District Court for
the Northern  District of Texas and the courts of the State of Texas  located in
Dallas County for the purposes of any suit, action or proceeding  arising out of
or relating to this Agreement or the Purchase Agreement,  and (ii) hereby waive,
and agree not to assert in any such suit,  action or proceeding,  any claim that
it is not personally  subject to the jurisdiction of such court,  that the suit,
action or  proceeding is brought in an  inconvenient  forum or that the venue of
the suit,  action or proceeding is improper.  Both the Company and the Purchaser
consent  to  process  being  served in any such suit,  action or  proceeding  by
mailing a copy  thereof to such party at the address in effect for notices to it
under this  Agreement  and agrees that such service  shall  constitute  good and
sufficient  service of process and notice thereof.  Nothing in this Section 8(e)
shall affect or limit any right to serve  process in any other manner  permitted
by law.

     (f) Amendments and Waivers. The provisions of this Agreement, including the
provisions of this sentence, may not be amended,  modified or supplemented,  and
waivers or consents to departures  from the provisions  hereof may not be given,
unless the same shall be in writing and signed by the Company and the Purchaser.

     (g)  Notices.  Any and all notices or other  communications  or  deliveries
required or permitted to be provided  hereunder shall be in writing and shall be
deemed given and  effective on the earlier of (i) the date of  transmission,  if
such  notice or  communication  is  delivered  via  facsimile  at the  facsimile
telephone number specified for notice prior to 5:00 p.m., Eastern Standard Time,
on a Business Day, (ii) the first  Business Day after the date of  transmission,
if such notice or  communication  is delivered  via  facsimile at the  facsimile
telephone  number  specified for notice later than 5:00 p.m.,  Eastern  Standard
Time, on any date and earlier than 11:59 p.m.,  Eastern  Standard  Time, on such
date,  (iii)  the  Business  Day  following  the  date  of  mailing,  if sent by
nationally  recognized  overnight courier service, or (iv) actual receipt by the
party to whom such notice is required to be given.

 (x)      if to the Company:

          Avitar, Inc.
          65 Dan Road
          Canton, Massachusetts  02021
          Attention:  Mr. Jay C. Leatherman, Jr., Chief Financial Officer
          Telecopier:  (781) 821-4458
          Telephone:  (781) 821-2400

      with a copy to:

          Dolgenos Newman & Cronin LLP
          96 Spring Street
          New York, New York  10012
          Attention:  Eugene M. Cronin, Esq.
          Telecopier: (212) 925-0690
          Telephone: (212) 925-2800

 (y)      if to the Purchaser:

          At the address of the Purchaser set forth on Exhibit A to this
 Agreement.

       with a copy to:

          Warren W. Garden, P.C.
          500 Crescent Court
          Suite 270
          Dallas, Texas  75201
          Attention:  Warren W. Garden, Esq.
          Telecopier: (214) 871-6711
          Telephone: (214) 871-6710

or to such other address or addresses or facsimile number or numbers as any such
party may most recently have  designated in writing to the other parties  hereto
by such notice.

     (h) Successors and Assigns.  This Agreement shall be binding upon and inure
to the benefit of the parties and their  successors  and  permitted  assigns and
shall inure to the benefit of the Holder and its  successors  and  assigns.  The
Company  may not  assign  this  Agreement  or any of its  respective  rights  or
obligations  hereunder  without the prior written consent of the Purchaser.  The
Purchaser  may assign its rights  hereunder  in the manner and to the Persons as
permitted under the Purchase Agreement.

     (i) Assignment of Registration  Rights. The rights of the Holder hereunder,
including  the  right  to have  the  Company  register  for  resale  Registrable
Securities in accordance with the terms of this  Agreement,  shall be assignable
by each Holder to any transferee of the Holder of all or a portion of the shares
of  Registrable  Securities  if:  (i) the  Holder  agrees  in  writing  with the
transferee  or assignee to assign such rights,  and a copy of such  agreement is
furnished to the Company within a reasonable  time after such  assignment;  (ii)
the Company is,  within a  reasonable  time after such  transfer or  assignment,
furnished with written notice of (A) the name and address of such  transferee or
assignee,  and (B) the securities with respect to which such registration rights
are being  transferred or assigned;  (iii) following such transfer or assignment
the further  disposition  of such  securities by the  transferee or assignees is
restricted  under the Securities Act and applicable  state securities laws; (iv)
at or before the time the Company  receives the written notice  contemplated  by
clause (ii) of this Section,  the transferee or assignee  agrees in writing with
the Company to be bound by all of the provisions of this Agreement; and (v) such
transfer shall have been made in accordance with the applicable  requirements of
the  Purchase  Agreement  and shall be for no less  than 50% of the  Registrable
Securities.  In  addition,  the Holder shall have the right to assign its rights
hereunder  to any other  Person with the prior  written  consent of the Company,
which consent shall not be unreasonably  withheld,  conditioned or delayed.  The
rights to assignment  shall apply to the Holder (and to  subsequent)  successors
and assigns.  In the event of an assignment  pursuant to this Section 8(i),  the
Purchaser shall pay all incremental  costs and expenses  incurred by the Company
in  connection  with filing a  Registration  Statement  (or an  amendment to the
Registration  Statement)  to  register  the  shares  of  Registrable  Securities
assigned to any assignee or transferee of the Purchaser.

     (j)  Counterparts.  This  Agreement  may  be  executed  in  any  number  of
counterparts,  each of which when so executed shall be deemed to be an original,
and all of which taken together shall constitute one and the same Agreement.  In
the event that any  signature  is  delivered  by  facsimile  transmission,  such
signature shall create a valid binding  obligation of the party executing (or on
whose behalf such signature is executed) the same with the same force and effect
as if such facsimile signature were the original thereof.

     (k)  Governing  Law. This  Agreement  shall be governed by and construed in
accordance with the laws of the State of Delaware,  without regard to principles
of  conflicts  of law  thereof.  This  Agreement  shall  not be  interpreted  or
construed  with any  presumption  against the party causing this Agreement to be
drafted.

     (l) Cumulative  Remedies.  The remedies  provided herein are cumulative and
not exclusive of any remedies provided by law.

     (m)  Termination.  This Agreement  shall terminate on the date on which all
remaining  Registrable  Securities may be sold without  restriction  pursuant to
Rule 144(k) of the Securities Act.

     (n) Severability.  If any term, provision,  covenant or restriction of this
Agreement is held to be invalid,  illegal, void or unenforceable in any respect,
the remainder of the terms,  provisions,  covenants and  restrictions  set forth
herein  shall  remain in full force and effect and shall in no way be  affected,
impaired or  invalidated,  and the  parties  hereto  shall use their  reasonable
efforts  to find  and  employ  an  alternative  means  to  achieve  the  same or
substantially  the same  result as that  contemplated  by such term,  provision,
covenant  or  restriction.  It is  hereby  stipulated  and  declared  to be  the
intention of the parties  that they would have  executed  the  remaining  terms,
provisions, covenants and restrictions without including any of such that may be
hereafter declared invalid, illegal, void or unenforceable.

     (o)  Headings.  The  headings  herein  are  for  convenience  only,  do not
constitute a part of this  Agreement  and shall not be deemed to limit or affect
any of the provisions hereof.


                  [Remainder of page intentionally left blank.]

     IN WITNESS WHEREOF, the parties hereto have caused this Registration Rights
Agreement to be duly executed by their respective  authorized  persons as of the
date first indicated above.


                                            AVITAR, INC.


                       By:
                       Name:  Peter P. Phildius
                       Title:    Chief Executive Officer



                       GRYPHON MASTER FUND, L.P.

                          By:  Gryphon Partners, L.P., its General Partner

                                By:  Gryphon Management Partners, L.P.,
                                          its General Partner

                                By:  Gryphon Advisors, LLC, its General Partner


                                    By: _____________________________
                                         Warren W. Garden, Authorized Agent



                                       A-1
                                    EXHIBIT A
                                  THE PURCHASER

Gryphon Master Fund, L.P.
500 Crescent Court
Suite 270
Dallas, Texas  75201
Tel. No.: (214) 871-6783
Fax No.: (214) 871-6909
Attn:  Ryan R. Wolters


                                       B-2
                                       B-1
                                    EXHIBIT B
                              PLAN OF DISTRIBUTION

     We are  registering  the  warrants  and the shares of  preferred  stock and
common stock on behalf of the selling stockholders.  The warrants and the shares
of preferred  stock and common stock may be sold in one or more  transactions at
fixed prices, at prevailing market prices at the time of sale, at prices related
to the  prevailing  market prices,  at varying prices  determined at the time of
sale, or at negotiated  prices.  These sales may be effected at various times in
one or more of the following transactions, or in other kinds of transactions:

o    transactions  on the American Stock Exchange or on any national  securities
     exchange or U.S.  inter-dealer  system of a registered  national securities
     association on which the warrants and our preferred  stock and common stock
     may be listed or quoted at the time of sale;

o    in the over-the-counter market;

o    in private transactions and transactions  otherwise than on these exchanges
     or systems or in the over-the-counter market;

o    in connection with short sales of the shares;

o    by pledge to secure or in payment of debt and other obligations;

o    through  the  writing of  options,  whether  the  options  are listed on an
     options exchange or otherwise;

o    in  connection  with the writing of  non-traded  and  exchange-traded  call
     options,  in hedge  transactions and in settlement of other transactions in
     standardized or over-the-counter options; or

o    through a combination of any of the above transactions.

     The selling  stockholder  and its  successors,  including its  transferees,
pledgees or donees or their successors,  may sell the warrants,  preferred stock
and  common  stock   directly  to  the   purchaser   or  through   underwriters,
broker-dealers or agents, who may receive compensation in the form of discounts,
concessions or commissions from the selling stockholder or the purchaser.  These
discounts,   concessions  or  commissions  as  to  any  particular  underwriter,
broker-dealer  or agent  may be in  excess  of those  customary  in the types of
transactions involved.

     In addition,  any securities  covered by this prospectus  which qualify for
sale  pursuant  to Rule 144 of the  Securities  Act may be sold  under  Rule 144
rather than pursuant to this prospectus.

     We entered  into a  registration  rights  agreement  for the benefit of the
selling stockholders to register the warrants and our preferred stock and common
stock under  applicable  federal and state  securities  laws.  The  registration
rights agreement provides for  cross-indemnification of the selling stockholders
and us and our respective  directors,  officers and controlling  persons against
specific  liabilities  in  connection  with the offer and sale of the  warrants,
preferred  stock and common stock,  including  liabilities  under the Securities
Act.  We will pay  substantially  all of the  expenses  incurred  by the selling
stockholders  incident  to the  registration  of the  offering  and  sale of the
warrants, preferred stock and common stock.


                                    EXHIBIT C

                         FORM OF NOTICE OF EFFECTIVENESS
                            OF REGISTRATION STATEMENT


                      [Name and address of Transfer Agent]
                               _________________
_________________
_________________
Attn:  ____________

                  Re:      Avitar, Inc.

Ladies and Gentlemen:

     We are counsel to Avitar, Inc., a Delaware corporation (the "Company"), and
have represented the Company in connection with that certain Securities Purchase
Agreement  (the  "Purchase  Agreement"),  dated as of August  13,  2003,  by and
between the Company and the Purchaser (the  "Purchaser")  named therein pursuant
to which the  Company  issued  to the  Purchaser  shares  of its 8%  Convertible
Preferred  Stock,  $0.001 par value (the  "Preferred  Stock").  Pursuant  to the
Purchase  Agreement,  the Company has also  entered into a  Registration  Rights
Agreement with the Purchaser (the "Registration Rights Agreement"),  dated as of
August 13, 2003,  pursuant to which the Company agreed,  among other things,  to
register  the  Registrable  Securities  (as defined in the  Registration  Rights
Agreement)  under the  Securities  Act of 1933, as amended (the "1933 Act").  In
connection  with  the  Company's   obligations  under  the  Registration  Rights
Agreement,  on _________ __, 2003, the Company filed a Registration Statement on
Form  S-3  (File  No.  333-________)  (the  "Registration  Statement")  with the
Securities  and Exchange  Commission  (the "SEC")  relating to the resale of the
Registrable   Securities  which  names  the  Purchaser  as  selling  stockholder
thereunder.

     In connection with the foregoing,  we advise you that a member of the SEC's
staff has advised us by  telephone  that the SEC has entered an order  declaring
the  Registration  Statement  effective  under  the 1933 Act at  [ENTER  TIME OF
EFFECTIVENESS] on [ENTER DATE OF EFFECTIVENESS] and we have no knowledge,  after
telephonic  inquiry  of a  member  of the  SEC's  staff,  that  any  stop  order
suspending its  effectiveness  has been issued or that any  proceedings for that
purpose are pending  before,  or threatened  by, the SEC and,  accordingly,  the
Registrable Securities are available for resale under the 1933 Act in the manner
specified in, and pursuant to the terms of, the Registration Statement.

                                      Very truly yours,




                                       By:


cc:      Gryphon Master Fund, L.P.