Easily and accurately measure the pH level to maintain a healthy freshwater aquarium with API pH Freshwater Aquarium Test Kit. Fish require a specific pH level to thrive. Waste, uneaten food and tap water can change pH levels and create harmful conditions for your fish and plants. This kit measures pH range from 6.0 to 7.6 and comes with pH test solution, glass test tube and easy-to-read pH color chart. Just fill the test tube with water, add a few drops of test solution and compare results with the color chart. Then follow the recommendations on the chart if any action needs to be taken. Test weekly to maintain a healthy balance.