Testing between 0-10.0 ppm Performs up to 60 tests Suitable for all aquarium types Ammonia is extremely toxic; highly levls place fish under extreme stress. Keeping Ammonia under control is very important. With the aid of this test kit you will help ensure your aquatic pets live long, happy, healthy lives. The biological cycle of your aquarium where excess food, fecal matter, urea and fish respiration results in the natural generation of Ammonia (NH3). It becomes lethal to aquatic animals in high concentrations robbing the aquarium water of oxygen, putting the fish under stress, leading to disease outbreaks and burnt gills. The water chemistry in an established aquarium (6 months old or more) will be altered with all new additions, whether it be ornaments, new fish or corals. It is therefore essential to monitor Ammonia levels regularly in your aquarium by the use of this test kit.