Quickly & accurately measure the Nitrate concentrations in saltwater! Aquaforest Nitrate TestPro is designed for quick measurement of Nitrate ions in a marine aquarium. Nitrate in water is the end result of biological filtration. High concentrations of nitrate cause the growth of undesirable algae. Nitrate levels in reef aquariums should be 2-5 mg/l (ppm). This test kit contains sufficient reagents to perform 40 tests of nitrate concentration. Test Includes: Reagent A-NO3 bottle Reagent B-NO3 container 1 test vial with a screw cap Syringe ? 1 ml Syringe ? 2 ml Measuring spoon Instruction manual Waterproof Color chart