Measures the most important aquarium health indicators quickly and accurately. Fish waste, uneaten food, plant refuse and other organic compounds can create harmful levels of ammonia, nitrite and nitrate as well as cause drastic fluctuations in pH. These unhealthy conditions can result in fish stress, gill and tissue damage and even death. It accurately measures these four saltwater parameters that are key to keeping your aquarium healthy, also protect marine fish and invertebrates from unsafe water conditions with. This kit has included with six bottles of liquid test reagent, four glass test tubes with snap-tight caps, a holding tray and a step-by-step instruction booklet with information on how to correct unsafe water conditions. Simply fill a clean test tube with 5 ml of water, add the appropriate test drops and compare results with the color chart. Then follow the recommendations to modify conditions if action is needed, it's easy to keep a beautiful saltwater, freshwater, or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide.