August 12, 2005

Dear Valued Customer,

For the foreseeable future, SPEX CertiPrep has decided to offer fewer proficiency testing studies than we have in the past. We will continue our PT program and accreditations, and with our same attention to quality, customer service and detail however the range and frequency of studies will be curtailed.

Effective September 19, 2005, we will no longer be offering Inorganic and Organic Proficiency Testing samples for Water Pollution and Water Supply. We will continue to offer Microbiological Proficiency Testing samples on a quarterly basis and DMRQA samples during that scheduled study. Also, we will continue to manufacture Quality Control Samples for all WP, WS and DMRQA samples. This will give you the opportunity to use a separate supplier for your QC and PT samples.

For the past year, SPEX CertiPrep has been working with Analytical Products Group (APG). If you would like to use APG for your future Proficiency Testing samples, they will be more than willing to work with you and they will offer you the SPEX CertiPrep price on all PT Samples through January 2006. For more information about their company, you can visit their website at www.apgqa.com or call them at 800-272-4442.

If you have any questions or concerns regarding the decisions that we have made, please contact us at 800-522-7739, x444.

Best regards,

Yvonne Cangelosi
Vice President
Sales and Marketing
SPEX CertiPrep