Keep your fish healthy and thriving by testing your aquarium water s NO3 levels regularly with this easy-to-use API NITRATE TEST KIT for freshwater and saltwater aquariums. Testing water parameters weekly helps prevent invisible water problems that can be harmful to fish. When left uncorrected high nitrate in aquarium water can lead to a build-up of organic pollutants and poor fish health. Testing is fast easy and accurate. The API NITRATE TEST KIT for freshwater and saltwater aquariums tests for harmful nitrate levels from 0-160 ppm. This product comes with one nitrate bottle one capped glass test tube one instruction manual and one color card. The API NITRATE TEST KIT for freshwater and saltwater aquariums Test Kit can be used in freshwater and saltwater aquariums. With API Aquarium products 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 A