Sometimes you need to reduce the amount of nitrogen in a body of water. It's balances of life may be disrupted otherwise. With this kit, the presence of nitrogen is indicated when the water samples turn pink. Includes enough materials for 150 individual qualitative test.10 calibrated sample tubes with caps 10 measuring spatulas 6 drop-controlled bottles of nitrate test solutions #1 3 bottles nitrate indicator powder #2 10 student worksheets and guides Instructions manual with MSDS