The Tetratest Total Ammonia Test kit is professionally developed to accurately determine the ammonia level in your aquarium water for the safety of your fish. Why Test? Ammonia (NH3) is a natural, toxic by-product of animal metabolism and the decomposition of animal and plant waste materials. Without regular testing, the ammonia level in your aquarium could rise to a level that is fatal to your fish. The kit contains enough material for 25 tests, including one 6-ml test reagent #1, one 10-ml test reagent #2, one 17-ml test reagent #3, a test vial, color scale, instructions and recommendations. Suitable for Freshwater (including outdoor ponds), Brackish, and Saltwater systems. Shipping weight: 1/4 lb.