DiaSys and VWR International Sign a Sales and Service Agreement for the United States.

Business Editors/Health/Medical Writers

WATERBURY, Conn.--(BUSINESS WIRE)--April 7, 2004

DiaSys Corporation (AMEX:DYX), a global healthcare products company, today announced that it has entered into a sales and service agreement for the United States with VWR International, one of the largest laboratory distributors in the world. Under the agreement, VWR sales representatives will promote, sell and service the complete DiaSys product portfolio, including urinalysis, parasitology, and electrophoresis instruments and disposables, throughout the United States.

Kimberly Smith-Bey, Clinical Product Manager of VWR said: "We are very excited about our new strategic relationship DiaSys Corporation. The addition of DiaSys Corporation's product line to our comprehensive product portfolio of laboratory supplies will enable VWR to expand our range of the value-added products and services that we deliver to our research and diagnostic customers in the United States."

Richard Sledziona, DiaSys' Executive Vice President said: "VWR's commitment to growth in the clinical laboratory arena is exactly what we have been seeking in order to expand our domestic market coverage and grow our domestic sales. We are looking forward to begin a series of sales training seminars throughout the country for VWR's sales team in order to grow our mutual business together."

About VWR International, Inc.

VWR International is a global leader in the distribution of scientific supplies, with worldwide sales of $2.8 billion. VWR's business is highly diversified across a spectrum of products and services, customer groups and geography. The company offers more than 750,000 products, from more than 5,000 manufacturers, to over 250,000 customers throughout North America and Europe. VWR's primary customers work in the pharmaceutical, life science, chemical, technology, food processing and consumer product industries. Other important customers include universities and research institutes; governmental agencies; environmental testing organizations; and primary and secondary schools. VWR International affiliates operate in 18 countries and employ almost 6,000 people. The company's mission is to deliver excellence in the distribution of scientific supplies. The VWR International Group is headquartered in West Chester, Pennsylvania.

For more information on VWR International, phone [phone] or write, VWR International, Inc., 1310 Goshen Parkway, P.O. Box 2656, West Chester, PA 19380-0906.

VWR and design are trademarks of VWR International, Inc.

DiaSys Corporation designs, develops, manufactures and distributes proprietary medical laboratory equipment, consumables and infectious disease test-kits to healthcare & veterinary laboratories worldwide. Headquartered in Waterbury, Connecticut USA, the Company operates in Europe through its wholly owned subsidiary based in Wokingham, England and in Pacific Asia through its strategic business partner located in Guangzhou, China. DiaSys, Parasep and Urisep are registered trademarks of DiaSys Corporation.

This press release contains forward-looking statements within the meaning of, and made pursuant to, the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. The forward looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company or events, or timing of events, relating to the Company to materially differ from those expressed or implied by such forward looking statements. DiaSys refers interested parties to its most recent Annual Report on Form 10-KSB and other SEC filings for a complete description of, and discussions about, the Company.