Document:

FIRST AMENDMENT TO REVOLVING CREDIT, TERM LOAN
                             AND SECURITY AGREEMENT

         THIS  AGREEMENT  is  entered  into as of August  31,  2000 by and among
RHEOMETRIC SCIENTIFIC, INC., a corporation organized under the laws of the State
of New Jersey ("RSI"),  RHEOMETRIC SCIENTIFIC LIMITED, a company organized under
the laws of England and Wales  ("RSL"),  RHEOMETRIC  SCIENTIFIC  FRANCE  SARL, a
limited liability company organized under the laws of France ("RSF"), RHEOMETRIC
SCIENTIFIC GmbH, a corporation  organized under the laws of Germany ("RSG"), and
RHEOMETRIC SCIENTIFIC F.E. LTD., a corporation organized under the laws of Japan
("RSLFE")  (each a  "Borrower"  and  collectively  "Borrowers"),  the  financial
institutions   which  are  now  or  which   hereafter   become  a  party  hereto
(collectively, the "Lenders" and individually a "Lender") and PNC BANK, NATIONAL
ASSOCIATION ("PNC"), as agent for Lenders (PNC, in such capacity, the "Agent").

                                    RECITALS

         Whereas,  the Borrowers and PNC entered into a Revolving  Credit,  Term
Loan and  Security  Agreement  dated  March 6, 2000 (as same is being and may be
further modified or extended, the "Loan Agreement"); and

         Whereas,  Borrowers and PNC have agreed to modify the terms of the Loan
Agreement as set forth in this First  Amendment To Revolving  Credit,  Term Loan
and Security  Agreement  (the  "Agreement")  to correct the Term Loan  repayment
schedule set forth therein.

         Now, therefore, in consideration of PNC's continued extension of credit
and the agreements contained herein, the parties agree as follows:

                                    AGREEMENT

1)   ACKNOWLEDGMENT  OF  BALANCE.  Borrower  acknowledges  that the most  recent
     statement of account sent to Borrower  with respect to the  Obligations  is
     correct.

2)   MODIFICATIONS. The Loan Agreement be and hereby is modified as follows:

     (A) Section  2.4 of the Loan  Agreement  be and hereby is  deleted,  and is
     replaced with new Section 2.4, to read as follows:

         2.4. Term Loan.  Subject to the terms and conditions of this Agreement,
         each  Lender,  severally  and not  jointly,  will  make a Term  Loan to
         Borrowers in the sum equal to such  Lender's  Commitment  Percentage of
         $1,500,000.00.  The Term Loan shall be advanced on the Closing Date and
         shall be, with respect to principal,  payable pursuant to the following
         schedule,  subject to  acceleration  upon the occurrence and during the
         continuance  of an Event of Default under this Agreement or termination
         of this Agreement:

               ----------------------------------- -----------------------------
                          Payment Date                          Amount
               ----------------------------------- -----------------------------
               ----------------------------------- -----------------------------
               June 6, 2000                        $75,000
               ----------------------------------- -----------------------------
               ----------------------------------- -----------------------------
               September 6, 2000                   $75,000
               ----------------------------------- -----------------------------
               ----------------------------------- -----------------------------
               December 6, 2000                    $75,000
               ----------------------------------- -----------------------------
               ----------------------------------- -----------------------------
               March 6, 2001                       $75,000
               ----------------------------------- -----------------------------
               ----------------------------------- -----------------------------
               April 6, 2001 through  February 6,  $25,000 each month
               2003
               ----------------------------------- -----------------------------
               ----------------------------------- -----------------------------
               March 6, 2003                       $625,000
               ----------------------------------- -----------------------------

         and  shall  be  evidenced  by  one or  more  secured  promissory  notes
         (collectively,  the "Term  Note") in  substantially  the form  attached
         hereto as Exhibit 2.4.

<PAGE>

     (B) Section  2.14 of the Loan  Agreement  be and hereby is deleted,  and is
     replaced with new Section 2.14, to read as follows:

         2.14  Letters of Credit.  Subject to the terms and  conditions  hereof,
         Agent shall issue or cause the issuance of Letters of Credit  ("Letters
         of Credit") on behalf of any Borrower;  provided,  however,  that Agent
         will not be  required  to issue or cause to be issued  any  Letters  of
         Credit to the extent that the total of the face amount of such  Letters
         of Credit  would  then cause the sum of (i) the  outstanding  Revolving
         Advances plus (ii)  outstanding  Letters of Credit to exceed the lesser
         of (x) the Maximum  Revolving Advance Amount or (y) the Formula Amount;
         and further  provided that Agent will not be required to issue or cause
         to be issued any  additional  Letter of Credit to the  extent  that the
         issuance of any such additional  Letter of Credit would cause the total
         of the face amount of all Letters of Credit to exceed $800,000.00.  All
         disbursements  or payments related to Letters of Credit shall be deemed
         to be Domestic Rate Loans  consisting  of Revolving  Advances and shall
         bear interest at the Revolving  Interest  Rate;  Letters of Credit that
         have not been drawn upon shall not bear interest.

     (C)  Sections  9.7,  9.8,  and 9.9 of the Loan  Agreement be and hereby are
     deleted,  and are replaced  with new Sections 9.7, 9.8, and 9.9, to read as
     follows:

         9.7. Annual Financial Statements. Furnish Agent within ninety (90) days
         after the end of each fiscal year of Borrowers, financial statements of
         Borrowers on a consolidating and consolidated basis including,  but not
         limited to, statements of income and stockholders' equity and cash flow
         from the beginning of the current fiscal year to the end of such fiscal
         year and the  balance  sheet  as at the end of such  fiscal  year,  all
         prepared in  accordance  with GAAP applied on a basis  consistent  with
         prior  practices,  and in  reasonable  detail and reported  upon,  with
         respect to the  consolidated  statements,  without  qualification by an
         independent  certified public accounting firm selected by Borrowers and
         reasonably satisfactory to Agent (the "Accountants"),  and with respect
         to the consolidating statements, by the Chief Financial Officer of RSI.
         The report of the  Accountants  shall be  accompanied by a statement of
         the Accountants certifying that (i) they have caused the Loan Agreement
         to be reviewed,  (ii) in making the examination  upon which such report
         was based either no information  came to their attention which to their
         knowledge  constituted  an Event of  Default  or a Default  under  this
         Agreement  or any related  agreement  or, if such  information  came to
         their attention,  specifying any such Default or Event of Default,  its
         nature, when it occurred and whether it is continuing,  and such report
         shall contain or have  appended  thereto  calculations  which set forth
         Borrowers'  compliance with the requirements or restrictions imposed by
         Sections  6.5, 7.6 and 7.11 hereof.  In addition,  the reports shall be
         accompanied  by a certificate  of RSI's Chief  Financial  Officer which
         shall state that,  based on an examination  sufficient to permit him to
         make an informed statement,  no Default or Event of Default exists, or,
         if such is not the case,  specifying  such Default or Event of Default,
         its nature,  when it occurred,  whether it is continuing  and the steps
         being  taken by such  Borrower  with  respect to such  event,  and such
         certificate  shall have appended thereto  calculations  which set forth
         Borrowers'  compliance with the requirements or restrictions imposed by
         Sections 6.5, 7.6 and 7.11 hereof.

         9.8. Quarterly  Financial  Statements.  Furnish Agent within forty-five
         (45) days after the end of each fiscal  quarter,  an unaudited  balance
         sheet of  Borrowers  on a  consolidated  and  consolidating  basis  and
         unaudited  statements of income and stockholders'  equity and cash flow
         of Borrowers  on a  consolidated  and  consolidating  basis  reflecting
         results of operations  from the beginning of the fiscal year to the end
         of such quarter and for such  quarter,  prepared on a basis  consistent
         with prior practices and complete and correct in all material respects,
         subject to normal and recurring year end adjustments that  individually
         and in the aggregate are not material to the business of Borrowers. The
         reports  shall be  accompanied  by a  certificate  signed  by the Chief
         Financial  Officer  of  RSI,  which  shall  state  that,  based  on  an
         examination sufficient to permit him to make an informed statement,  no
         Default  or Event  of  Default  exists,  or,  if such is not the  case,
         specifying  such  Default  or Event of  Default,  its  nature,  when it
         occurred,  whether  it is  continuing  and the  steps  being  taken  by
         Borrowers with respect to such default and, such certificate shall have
         appended thereto  calculations  which set forth  Borrowers'  compliance
         with the requirements or restrictions  imposed by Sections 6.5, 7.6 and
         7.11 hereof.

                                       2

<PAGE>

         9.9.  Monthly  Financial  Statements.  Furnish Agent within thirty (30)
         days  after  the end of each  month,  an  unaudited  balance  sheet  of
         Borrowers  on a  consolidated  and  consolidating  basis and  unaudited
         statements  of  income  and  stockholders'  equity  and  cash  flow  of
         Borrowers on a consolidated and consolidating  basis reflecting results
         of operations  from the beginning of the fiscal year to the end of such
         month and for such  month,  prepared on a basis  consistent  with prior
         practices and complete and correct in all material respects, subject to
         normal and recurring year end adjustments that  individually and in the
         aggregate  are not material to the business of  Borrowers.  The reports
         shall be accompanied by a certificate of RSI's Chief Financial Officer,
         which shall state that,  based on an  examination  sufficient to permit
         him to make an  informed  statement,  no  Default  or Event of  Default
         exists,  or, if such is not the case,  specifying such Default or Event
         of Default, its nature, when it occurred,  whether it is continuing and
         the steps being taken by Borrowers with respect to such event and, such
         certificate  shall have appended thereto  calculations  which set forth
         Borrowers'  compliance with the requirements or restrictions imposed by
         Sections 6.5, 7.6 and 7.11 hereof.

3)   CONSENT  AND  WAIVER.  The Agent and the  Lenders  hereby  consent to RSI's
     proposed   reincorporation   merger   pursuant  to  which  RSI's  state  of
     incorporation will change from New Jersey to Delaware (the "Reincorporation
     Merger"). Any default that would otherwise be deemed to have occurred under
     Sections  7.1  and  7.15  of  the  Loan   Agreement  as  a  result  of  the
     Reincorporation  Merger be and is hereby  waived,  solely  for the  limited
     purpose of allowing the Reincorporation Merger to occur.

4)   ACKNOWLEDGMENTS. Borrowers acknowledge and represent that:

     (A) the Loan Agreement and other Loan Documents,  as amended hereby, are in
     full force and effect without any defense,  claim,  counterclaim,  right or
     claim of set-off;

     (B) to the best of their  knowledge,  no default by the Agent or Lenders in
     the  performance of their duties under the Loan Agreement or the other Loan
     Documents has occurred;

     (C) all  representations  and warranties  contained herein and in the other
     Loan  Documents  are true  and  correct  as of this  date,  except  for any
     representation or warranty that specifically refers to an earlier date;

     (D) Borrowers  have taken all  necessary  action to authorize the execution
     and delivery of this Agreement; and

     (E) this Agreement is a modification of an existing obligation and is not a
     novation.

5)   PRECONDITIONS.  As a  precondition  to  the  effectiveness  of  any  of the
     modifications,  consents,  or waivers contained herein, the Borrower agrees
     to:

     (A) provide the Bank with a resolution, in form and substance acceptable to
     the Bank, which approves the modification contemplated hereby.

     (B)  provide  the Bank with drafts of all  documents  to be executed  (and,
     promptly  after their  execution,  facsimile and  overnight  mail copies of
     executed versions thereof) in connection with the  Reincorporation  Merger,
     all to be in form and substance reasonably acceptable to the Bank.

     (C) pay all fees and  costs  incurred  by the Bank in  entering  into  this
     Agreement and the other documents executed in connection herewith.

                                       3

<PAGE>

6)   MISCELLANEOUS.  This  Agreement  shall be construed in accordance  with and
     governed by the laws of the State of New Jersey,  without reference to that
     state's  conflicts of law  principles.  This  Agreement  and the other Loan
     Documents  constitute the sole agreement of the parties with respect to the
     subject  matter  thereof  and  supersede  all oral  negotiations  and prior
     writings with respect to the subject matter  thereof.  No amendment of this
     Agreement,  and no waiver of any one or more of the provisions hereof shall
     be effective  unless set forth in writing and signed by the parties hereto.
     The illegality,  unenforceability or inconsistency of any provision of this
     Agreement   shall  not  in  any  way   affect  or  impair   the   legality,
     enforceability or consistency of the remaining provisions of this Agreement
     or the other Loan  Documents.  This  Agreement and the other Loan Documents
     are intended to be consistent. However, in the event of any inconsistencies
     among  this  Agreement  and any of the Loan  Documents,  the  terms of this
     Agreement,  then the Loan Agreement,  shall control.  This Agreement may be
     executed  in any number of  counterparts  and by the  different  parties on
     separate  counterparts.  Each such counterpart shall be deemed an original,
     but all  such  counterparts  shall  together  constitute  one and the  same
     agreement.

7)   DEFINITIONS.  The terms used herein and not  otherwise  defined or modified
     herein shall have the meanings ascribed to them in the Loan Agreement.  The
     terms used herein and not otherwise  defined or modified  herein or defined
     in the Loan  Agreement  shall  have the  meanings  ascribed  to them by the
     Uniform Commercial Code as enacted in New Jersey.

                                       4
<PAGE>

IN WITNESS  WHEREOF,  the undersigned  have signed and sealed this Agreement the
day and year first above written.

ATTEST:                                RHEOMETRIC SCIENTIFIC, INC.

By:/s/                                 By:/s/ Joseph Musanti
   ---------------------                  ---------------------------
Name:                                     Name:  JOSEPH MUSANTI
Title:                                    Title: Vice President

ATTEST:                                RHEOMETRIC SCIENTIFIC LIMITED

By:/s/                                 By: /s/ Joseph Musanti
   ---------------------                  ---------------------------
Name:                                     Name:  JOSEPH MUSANTI
Title:                                    Title: Director

WITNESS:                               RHEOMETRIC SCIENTIFIC FRANCE SARL

BY:/s/                                 By:/s/ Joseph Musanti
   ---------------------                  ---------------------------
       Name:                              Name:  JOSEPH MUSANTI
       Title:                             Title: Manager

WITNESS:                               RHEOMETRIC SCIENTIFIC GmbH

BY:/s/                                 By:/s/ Joseph Musanti
   ---------------------                  ---------------------------
       Name:                              Name:  JOSEPH MUSANTI
       Title:                             Title: Under Power of Attorney from
                                          Manfred Herzog, Managing Director

WITNESS:                               RHEOMETRIC SCIENTIFIC F.E. LTD.

BY:/s/                                 By: /s/ Joseph Musanti
   ---------------------                  ---------------------------
       Name:                              Name:  JOSEPH MUSANTI
       Title:                             Title: Chairman and Representative
                                          Director

                                       PNC BANK,  NATIONAL  ASSOCIATION,  as
                                       Lender and as Agent

                                       By:/s/ Michelle Stanley-Nurse
                                          -----------------------------
                                          Name:  MICHELLE STANLEY-NURSE
                                          Title: Vice President

                                       5SECOND AMENDMENT TO REVOLVING CREDIT, TERM LOAN
                             AND SECURITY AGREEMENT

         THIS SECOND  AMENDMENT  TO  REVOLVING  CREDIT,  TERM LOAN AND  SECURITY
AGREEMENT  (the  "Agreement")  is entered into as of March 16, 2001 by and among
RHEOMETRIC SCIENTIFIC, INC., a corporation organized under the laws of the State
of Delaware ("RSI"),  RHEOMETRIC  SCIENTIFIC  LIMITED, a company organized under
the laws of England and Wales  ("RSL"),  RHEOMETRIC  SCIENTIFIC  FRANCE  SARL, a
limited liability company organized under the laws of France ("RSF"), RHEOMETRIC
SCIENTIFIC GmbH, a corporation  organized under the laws of Germany ("RSG"), and
RHEOMETRIC SCIENTIFIC F.E. LTD., a corporation organized under the laws of Japan
("RSLFE") (each an "Existing Borrower" and collectively  "Existing  Borrowers"),
PROTEIN SOLUTIONS HOLDINGS,  INC., a corporation organized under the laws of the
State of Delaware  ("PSI"),  PROTEIN  SOLUTIONS,  INC., a corporation  organized
under the laws of the State of Virginia  ("Protein Inc."), and PROTEIN SOLUTIONS
LIMITED,  a corporation  organized under the laws of England and Wales ("Protein
Ltd."),  (each  an  "Additional   Borrower"  and  collectively  the  "Additional
Borrowers")  (the  Existing   Borrowers  and  the  Additional   Borrowers  shall
hereinafter   sometimes  be  referred  to   collectively   as  "Borrowers"   and
individually as "Borrower"),  the financial  institutions which are now or which
hereafter become a party hereto (collectively,  the "Lenders" and individually a
"Lender") and PNC BANK, NATIONAL ASSOCIATION ("PNC"), as agent for Lenders (PNC,
in such capacity, the "Agent").

                                    RECITALS

         Whereas,  the  Existing  Borrowers  and PNC  entered  into a  Revolving
Credit,  Term Loan and Security Agreement dated March 6, 2000, as amended by the
First Amendment  thereto dated August 31, 2000 (as may be further  amended,  the
"Loan Agreement"); and

         Whereas,  Borrowers and PNC have agreed to modify the terms of the Loan
Agreement as set forth in this Agreement to include the Additional  Borrowers as
Borrowers.

         Now, therefore, in consideration of PNC's continued extension of credit
and the agreements contained herein, the parties agree as follows:

                                    AGREEMENT

1)   ACKNOWLEDGMENT  OF  BALANCE.  Borrower  acknowledges  that the most  recent
     statement of account sent to Borrower  with respect to the  Obligations  is
     correct.

2)   MODIFICATIONS. The Loan Agreement be and hereby is modified as follows:

     (A) The definition of "Borrower" contained in Section 1.2 is hereby deleted
     and a new definition is substituted therefor to read as follows:

         "Borrower"  or  "Borrowers"  shall  have the  meaning  set forth in the
         preamble to this Agreement and shall also include PSI, Protein Inc. and
         Protein Ltd. and shall extend to all permitted  successors  and assigns
         of such Persons.

     (B)  Exhibits  2.1(a) and 2.4(a) are hereby  deleted  and  replaced  by new
     Exhibits 2.1(a) and 2.4(a) attached hereto.

     (C) Schedules 1.1, 1.2, 4.5, 4.15(c),  4.19, 5.2(a), 5.2(b), 5.4, 5.6, 5.7,
     5.9 and 7.8 are hereby  deleted and replaced with new  Schedules  1.1, 1.2,
     4.5, 4.15(c), 4.19, 5.2(a), 5.2(b), 5.4, 5.6, 5.7, 5.9 and 7.8.

3)   ACKNOWLEDGMENTS. Borrowers acknowledge and represent that:

     (A) the Loan Agreement and other Loan Documents,  as amended hereby, are in
     full force and effect without any defense,  claim,  counterclaim,  right or
     claim of set-off;

     (B) to the best of their  knowledge,  no default by the Agent or Lenders in
     the  performance of their duties under the Loan Agreement or the other Loan
     Documents has occurred;

<PAGE>

     (C) all  representations  and warranties  contained herein and in the other
     Loan  Documents  are true and correct in all  material  respects as of this
     date, except for any representation or warranty that specifically refers to
     an earlier date;

     (D) Borrowers  have taken all  necessary  action to authorize the execution
     and delivery of this Agreement; and

     (E) this Agreement is a modification of an existing obligation and is not a
     novation.

4)   PRECONDITIONS.  As a  precondition  to  the  effectiveness  of  any  of the
     modifications,  consents,  or waivers contained herein, the Borrower agrees
     to provide the Bank with the information and documentation set forth on the
     Closing Agenda and Document List attached hereto as Schedule A.

5)   MISCELLANEOUS.  This  Agreement  shall be construed in accordance  with and
     governed by the laws of the State of New Jersey,  without reference to that
     state's  conflicts of law  principles.  This  Agreement  and the other Loan
     Documents  constitute the sole agreement of the parties with respect to the
     subject  matter  thereof  and  supersede  all oral  negotiations  and prior
     writings with respect to the subject matter  thereof.  No amendment of this
     Agreement,  and no waiver of any one or more of the provisions hereof shall
     be effective  unless set forth in writing and signed by the parties hereto.
     The illegality,  unenforceability or inconsistency of any provision of this
     Agreement   shall  not  in  any  way   affect  or  impair   the   legality,
     enforceability or consistency of the remaining provisions of this Agreement
     or the other Loan  Documents.  This  Agreement and the other Loan Documents
     are intended to be consistent. However, in the event of any inconsistencies
     among  this  Agreement  and any of the Loan  Documents,  the  terms of this
     Agreement,  then the Loan Agreement,  shall control.  This Agreement may be
     executed  in any number of  counterparts  and by the  different  parties on
     separate  counterparts.  Each such counterpart shall be deemed an original,
     but all  such  counterparts  shall  together  constitute  one and the  same
     agreement.

6)   DEFINITIONS.  The terms used herein and not  otherwise  defined or modified
     herein shall have the meanings ascribed to them in the Loan Agreement.  The
     terms used herein and not otherwise  defined or modified  herein or defined
     in the Loan  Agreement  shall  have the  meanings  ascribed  to them by the
     Uniform Commercial Code as enacted in New Jersey.

IN WITNESS  WHEREOF,  the undersigned  have signed and sealed this Agreement the
day and year first above written.

ATTEST:                                RHEOMETRIC SCIENTIFIC, INC.

By:/s/                                 By:/s/ Joseph Musanti
------------------------                  ---------------------------
Name:                                     Name:  JOSEPH MUSANTI
Title:                                    Title:  Vice President

ATTEST:                                RHEOMETRIC SCIENTIFIC LIMITED

By:/s/                                 By:/s/ Joseph Musanti
------------------------                  ---------------------------
Name:                                     Name:  JOSEPH MUSANTI
Title:                                    Title: Director

                                       2

<PAGE>

                                       RHEOMETRIC SCIENTIFIC FRANCE SARL

                                       By:/s/ Joseph Musanti
                                          ----------------------------
                                          Name: JOSEPH MUSANTI
                                          Title: Manager

                                       RHEOMETRIC SCIENTIFIC GmbH

                                       By:/s/ Joseph Musanti
                                          ---------------------------
                                          Name: JOSEPH MUSANTI
                                          Title: Under Power of Attorney from
                                          Manfred Herzog, Managing Director

                                       RHEOMETRIC SCIENTIFIC F.E. LTD.

                                       By:/s/ Joseph Musanti
                                          ---------------------------
                                          Name: JOSEPH MUSANTI
                                          Title: Chairman and Representative
                                          Director

ATTEST:                                PROTEIN SOLUTIONS HOLDINGS, INC.

BY: /s/                                By: /s/ Robert P. Collins, Jr.
   ---------------------                  ---------------------------
       Name:                              Name:  ROBERT P. COLLINS, JR.
       Title:                             Title: Vice President

ATTEST:                                 PROTEIN SOLUTIONS, INC.

BY:/s/                                 By: /s/ Robert P. Collins, Jr.
   ---------------------                   --------------------------
       Name:                               Name:  ROBERT P. COLLINS, JR.
       Title:                              Title: Vice President

                                        PROTEIN SOLUTIONS LIMITED

                                        By: /s/ Mark F. Callaghan
                                           --------------------------
                                           Name:  MARK F. CALLAHAN
                                           Title: Director

                                        PNC BANK, NATIONAL ASSOCIATION, as
                                        Lender and as Agent

                                        By:/s/ Michelle Stanley-Nurse
                                           --------------------------
                                           Name: MICHELLE STANLEY-NURSE
                                           Title:  Vice President

                                       3

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