The API Ammonia Test Kit measures ammonia levels in both fresh and saltwater aquariums. Ammonia, the number one killer of tropical fish, is continually produced in the aquarium from fish waste, decomposing plants and uneaten fish food.Ammonia NH3/NH4+ test kitMonitors toxic ammonia to help prevent fish lossFor fresh and saltwater aquariumsAmmonia in the aquarium will damage delicate gill membranes and prevent fish from carrying on normal respiration. High levels of ammonia quickly lead to fish death. Even trace amounts can stress fish, suppressing their immune systems and thereby increasing the likelihood of disease and subsequent fish loss.This fast, accurate and easy-to-use kit contains: 2 dropper bottles, test solutions, easy-to-read instructions, color chart and glass tube with lid. Provides 130 tests for ammonia levels from 0 to 8 ppm.