Quickly & accurately measures the level of ammonia in freshwater and saltwater aquariums, reading levels from 0 ppm to 8 ppm. Makes 130 tests. Determines the level of toxic ammonia in both new & established aquariums. Ammonia is continuously produced from fish waste urine, uneaten fish food & decaying plants & dead insects. Includes test solution, glass test tube w/ cap, color chart & instructions.