Hi Beth I would like to recommend Poly Scientific R&D Corp.,phone 800-645-5825, 800-832-5869. The others: Rowley Biochemical Inc. 978-739-4883, or Master Tech 800-860-4073. Galina Deyneko Cambridge, MA, Novartis --------------------------------- How low will we go? Check out Yahoo! Messenger’s low PC-to-Phone call rates.