The Barnant 2610810 paddle tester screens water samples, solid surfaces, and nonviscous liquids for total aerobic bacteria and yeast and mold using the presence-absence method. The double-sided slide attached to the vial cap allows each side of the slide to perform a separate test. A molded-in grid allows colony counting without opening the clear, leak-proof vial. The package contains 10 Tryptone Glucose Extract Agar/Sabouraud Dextrose Agar paddle testers.Thermo Fisher Scientific manufactures analytical instruments, laboratory equipment, consumables, and software under the Thermo Scientific, Fisher Scientific, Barnstead, and Nalgene brands, among others. The company is headquartered in Waltham, MA.