API Ammonia Test Kit monitors ammonia levels from 0-8 ppm (mg/L) in freshwater or saltwater to prevent fish loss. Tropical fish continually release ammonia into the aquarium through their gills, urine, and solid waste. Uneaten food and decaying organic matter can also add ammonia to the water. Small amounts of ammonia can stress fish suppressing their immune system leading to disease outbreaks, but large amounts can lead to fish death. With API Ammonia Test Kit, you can easily and accurately measure the ammonia level and take the steps to remove it. This kit includes: 2 liquid dropper bottles, easy-to-read instructions on how to test and correct water conditions, 2 color charts, and a glass test tube. 130 tests per kit. Shipping weight: 1/3 lb.