Simply fill a clean test tube with 5 ml of water, add the appropriate test drops and compare results with the colour chart. Then follow the recommendations to modify conditions if action is needed. Includes 6 bottles of testing solution, 1 colour card and 4 glass test tubes with cap. Measures levels of high range pH, ammonia, nitrite and nitrate. Helps monitor and adjust pH. Provides high accuracy results that ultimately prevent fish loss.