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| Waiver and Ninth Amendment to Loan Documents |                                       |
|----------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

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|               |           |                       |
|--------------------|----------------|----------------------------|
| WITNESS / ATTEST:  |           | STRATEGIC DIAGNOSTICS INC. |
|               |           |                       |
| /s/ Hilary R. Bond |           | By:                        | /s/ Stanley Franczkowski |
|               |           | (SEAL)                     |
| Print Name:        | Hilary R. Bond |                       | Print Name: | STANLEY FRANCZKOWSKI |
|               |           |                       |   |   |
| Title:             |           |                       | Title: | CFO |

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|   |               |                  |
|--------|--------------------|-----------------------|
|   | PNC BANK, DELAWARE |
|   |               |
|   | By:                | /s/ Warren C. Engle   |
|   |               | Warren C. Engle       | SEAL) |
|   |               | Senior Vice President |   |

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|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| A.     | The “Loan Documents” that are the subject of this Amendment include the following (as any of the foregoing have previously been amended, modified or otherwise supplemented): |
|   |                                                                                                                                                                                      |
|   | 1.                                                                                                                                                                                        | Loan Agreement dated as of May 5, 2000, as amended by an Amendment to Loan Documents dated as of December 13, 2001, a Second Amendment to Loan Documents dated as of April 25, 2002, a Third Amendment to Loan Documents dated as of October 24, 2002, a Fourth Amendment to Loan Documents dated as of February 11, 2003, a Fifth Amendment to Loan Documents dated as of February 16, 2004, a Sixth Amendment to Loan Documents dated as of September 16, 2005, and a Seventh Amendment to Loan Documents dated as of August 21, 2007 and a Waiver and Eighth Amendment to Loan Documents dated as of October I, 2008 (the “Loan Agreement”) |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 2.                                                                                                                                                                                        | Committed Line of Credit Note dated May 5, 2000 in the maximum principal amount of $5,000,000.00 (the “Existing Line of Credit Note”)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 3.                                                                                                                                                                                        | Term Note B dated December 13, 2001 in the original principal amount of $1,500,000 (the “2001 Term Note”)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 4.                                                                                                                                                                                        | Term Note dated August 21, 2007 in the original principal amount of $2,000,000 (the “2007 Term Note”)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 5.                                                                                                                                                                                        | Working Cash®, Line of Credit, Investment Sweep Rider dated May 5, 2000 (the “Working Cash Rider”)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 6.                                                                                                                                                                                        | Mortgage, Assignment of Rents, Security Agreement Fixture Filing dated May 5, 2000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 7.                                                                                                                                                                                        | Assignment of Rents and Leases dated May 5, 2000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 8.                                                                                                                                                                                        | Mortgage, Assignment of Rents, Security Agreement and Fixture Filing dated December 13, 2001                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 9.                                                                                                                                                                                        | Mortgage dated June 10, 2008                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 10.                                                                                                                                                                                       | Security Agreement dated May 5, 2000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 11.                                                                                                                                                                                       | Patent Security Agreement dated May 5, 2000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 12.                                                                                                                                                                                       | Trademark Security Agreement dated May 5, 2000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 13.                                                                                                                                                                                       | Rider to Security Rider - Patents dated May 5, 2000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 14.                                                                                                                                                                                       | Rider to Security Rider - Trademarks dated May 5, 2000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   | 14.                                                                                                                                                                                       | All other documents, instruments, agreements, and certificates executed and delivered in connection with the Loan Documents listed in this Section A.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |

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| B.          The Borrower has acknowledged and agreed with the Bank that the Borrower failed to comply with (i) the Funded Debt to EBITDA requirement contained in Section 4.9(a) of the Financial Covenants set forth in the Addendum to the Loan Agreement for each of the Borrower’s fiscal quarters ended December 31, 2008 and March 31, 2009, and (ii) the Debt Service Coverage requirement contained in Section 4.9(b) of the Financial Covenants set forth in the Addendum to the Loan Agreement for each of the Borrower’s fiscal quarters ended December 31, 2008 and March 31, 2009. The Borrower’s failure to comply with the forgoing covenants constitutes Events of Default under the Loan Documents. The Borrower has requested that the Bank waive the Events of Default. In reliance upon the Borrower’s representations and warranties and subject to the terms and conditions herein set forth, the Bank agrees to grant a waiver of Borrower’s non-compliance with the foregoing covenants and of the Events of Default that would otherwise result from a violation of such covenants solely for the above-referenced periods. The Borrower agrees that it will hereafter comply fully with these covenants and all other provisions of the Loan Documents, which remain in full force and effect. Except as expressly described in this Amendment, this waiver shall not constitute (a) a modification or an alteration of the terms, conditions or covenants of the Loan Documents or (b) a waiver, release or limitation upon the Bank’s exercise of any of its rights and remedies thereunder, which are hereby expressly reserved. This waiver shall not relieve or release the Borrower in any way from any of its respective duties, obligations, covenants or agreements under the Loan Documents or from the consequences of any Event of Default thereunder, except as expressly described above. This waiver shall not obligate the Bank, or be construed to require the Bank, to waive any other Events of Default or defaults, whether now existing or which may occur after the date of this waiver. |
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|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
| C.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | The Loan Documents are amended as follows: |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 1. | The Loan Agreement is hereby amended as follows: |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | (a) | The first sentence of Section 1 is amended and restated to read in full as follows: |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   | “The Bank has made or may make one or more loans to the Borrower, including without limitation a $1,000,000 line of credit (the “Line of Credit”); a term loan with an original principal balance of $1,500,000 (the “2001 Term Loan”); and a term loan with an original principal balance of $2,000,000 (the “2007 Term Loan” and, collectively with the Line of Credit and the 2001 Term Loan, the “Loan”).” |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | (b) | Section 1.2 is amended and restated to read in full as follows: |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   | “Interest on the unpaid balance of the Line of Credit advances will be charged at the rates, and be payable on the dates and times, set forth in the Note evidencing the Line of Credit, and interest on each of the 2001 Term Loan and the 2007 Term Loan will be charged at the rates, and be payable at the dates and times, set forth in the Note evidencing each of the respective Term Loans; the Note evidencing the 2007 Term Loan will also contain a prepayment cost recovery provision requiring a payment to the Bank equal to the losses incurred by the Bank as a result of such prepayment.” |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | (d)     In addition to the Mortgages and the Security Agreements included in the listing of the “Loan Documents” above, the defined term “Security Documents” shall include a Pledge Agreement (Bank Deposits) pursuant to which the Borrower pledges cash collateral as additional security for the Loans. |

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|   |                                                                                                                                                                                                        | (e) Section 4.9 of the Addendum to the Loan Agreement is hereby amended and restated to read in full as follows:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   |                                                                                                                                                                                                        |           “4.9 Financial Covenants                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   |                                                                                                                                                                                                        |           a. The Borrower will maintain at all times a minimum Tangible Net Worth of not less than $18,500,000, measured on a quarterly basis.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   |                                                                                                                                                                                                        |           b. The Borrower will maintain at all times a minimum EBITDA of (i) a loss of not more than $100,000 for the fiscal quarter ending June 30, 2009, and (ii) not less than (A) $200,000 for the fiscal quarter ending September 30, 2009, and (B) $400,000 for the fiscal quarter ending December 31, 2009 and each fiscal quarter thereafter.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   |                                                                                                                                                                                                        | As used herein:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   |                                                                                                                                                                                                        | “EBITDA” means the Borrower’s net income plus interest expense plus income tax expense plus depreciation plus amortization.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   |                                                                                                                                                                                                        | “Tangible Net Worth” means stockholders equity in the Borrower less any advances to affiliated parties less all items properly classified as intangibles.”                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   | 2.                                                                                                                                                                                                          | Concurrently with the execution and delivery of this Amendment, the Borrower shall execute and deliver to the Bank an amended and restated committed line of credit note (the “Restated Line of Credit Note”) evidencing the Line of Credit in the principal amount of $1,000,000. Upon receipt by Bank of the Restated Line of Credit Note, the Existing Line of Credit Note shall be cancelled and returned to the Borrower; the Line of Credit and all accrued and unpaid interest on the Existing Line of Credit Note shall thereafter be evidenced by the Restated Line of Credit Note; and all references to the “Note” evidencing the Line of Credit in any documents relating thereto shall thereafter be deemed to refer to the Restated Line of Credit Note. Without duplication, the Restated Line of Credit Note shall not constitute a novation and shall in no way extinguish the Borrower’s unconditional obligation to repay all indebtedness, including accrued and unpaid interest, evidenced by the Existing Line of Credit Note. |
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   | 3.                                                                                                                                                                                                          | The Working Cash Rider is hereby terminated.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| C.     | Conditions to Effectiveness of Amendment: The Bank’s willingness to agree to the waiver and amendments set forth in this Amendment are subject to the prior satisfaction of the following conditions: |
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   | 1.                                                                                                                                                                                                          | Execution by all parties and delivery to the Bank of this Amendment, and execution by the Borrower and delivery to the Bank of an Amended and Restated Committed Line of Credit Note evidencing the Line of Credit, and a Pledge Agreement (Bank Deposits), all in form and substance satisfactory to the Bank.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|   |                                                                                                                                                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|   | 2.                                                                                                                                                                                                          | Payment of a documentation fee in connection with this Amendment in the amount of $1,000.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |