High nitrate levels in your aquarium indicate a build-up of fish waste and organic compounds, resulting in poor water quality and an increase in algae growth. Contrarily, maintaining a low nitrate level improves the health of fish and invertebrates. Use the API Nitrate Test Kit to ensure that the nitrate levels in your tank are safe and healthy for your fish. The Nitrate Test Kit reads parameters from 0 to 160 ppm, and contains 2 bottles of liquid test reagent, 2 color cards for easy comparison, 1 glass test tube with a snap-tight cap, and step-by-step instructions on how to correct unsafe conditions. It may be used for both fresh and saltwater aquariums. We recommend that you take a few minutes each week to monitor your aquarium conditions and create a better underwater world for your fish. Testing your aquarium water has never been so easy or accurate!. Contains 90 tests and includes 2 test solutions, easy-to-ready instructions, glass test tube and color chart.