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

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|                                                              |   |                           |
|-------------------------------------------------------------------|--------|--------------------------------|
| WITNESS / ATTEST:                                                 |   | STRATEGIC DIAGNOSTICS INC.     |
|                                                              |   |                           |   |
| /s/ Mary Gedney                                              |   | By:                            | /s/ Kevin J. Bratton  |
|                                                              |   |                           | (SEAL) |
| Print Name: MARY GEDNEY                                           |   | Print Name: KEVIN J.BRATTON    |
|                                                              |   |                           |   |
| Title:                                                            |   | Title: CHIEF FINANCIAL OFFICER |
| (Include title only if an officer of entity signing to the right) |   |                           |   |

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|   |   | PNC BANK, DELAWARE |
|--------|--------|--------------------|
|   |   |               |   |
|   |   | By:                | /s/ Warren C. Engle  |
|   |   |               | (SEAL) |
|   |   |               | Warren C. Engle |
|   |   |               | 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, a Waiver and Eighth Amendment to Loan Documents dated as of October 1, 2008, and a Waiver and Ninth Amendment to Loan Documents dated as of May 15, 2009 (as amended, the “Loan Agreement”) |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|   | 2.                                                                                                                                                                                        | Amended and Restated Committed Line of Credit Note dated May 15, 2009 in the maximum principal amount of $1 ,000,000.00 (the “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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|   |                                                                                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|   | 15.                                                                                                                                                                                       | 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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|   |   |                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|   | 1.     | The Line of Credit, as defined in the Loan Agreement, is hereby cancelled and, upon the satisfaction of all of the Conditions to Effectiveness of this Amendment as set forth in subsection D, below, the Line of Credit Note shall be cancelled and returned to the Borrower. |
|   |   |                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                        |
|   | 2.     | 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 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 2001 Term Loan, the “Loan”).”                                         |
|   |   |                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                        |
|   |   | (b)                                                                                                                                                                                                                                                                            | Section 1.2 is amended and restated to read in full as follows:                                                                                                                                                                                                                                                                                                                                                             |
|   |   |                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                        |
|   |   |                                                                                                                                                                                                                                                                           | “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.” |
|   |   |                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                        |
|   |   | (c)                                                                                                                                                                                                                                                                            | Section 4.3 is deleted in its entirety.                                                                                                                                                                                                                                                                                                                                                                                     |
|   |   |                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                        |
|   |   | (d)                                                                                                                                                                                                                                                                            | Section 4.9 of the Addendum to the Loan Agreement is hereby deleted in its entirety.                                                                                                                                                                                                                                                                                                                                        |
|   |   |                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                        |
|   | 2.     | The Pledge Agreement is hereby amended by amending and restating Exhibit A thereto to read in full as follows:                                                                                                                                                                 |

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| Issuer             |   | Dollar Amount |         | Account Title/Account No. |
|--------------------|--------|---------------|--------------|---------------------------|
|               |   |          |         |                      |
| PNC Bank, Delaware |   | $             | 1,251,000.00 |                      | Strategic Diagnostics Inc./ 31500340608 |

| D.     | 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, in form and substance satisfactory to the Bank. |
|   |                                                                                                                                                                                                        |   |
|   | 2.                                                                                                                                                                                                          | Payment of a documentation fee in connection with this Amendment in the amount of $2,000. |