Contains one (1) API PH TEST KIT 250-Test Freshwater Aquarium Water pH Test Kit, including one bottle of testing solution, one colour card and one glass test tube with cap Helps monitor and adjust pH and prevent invisible water problems that can be harmful to fish Accurately reads pH 6.0 - 7.6 and helps avoid fish loss Because different geographies have different tap water conditions and different fish need different pH levels to be healthy, API helps measure pH levels and detect pH fluctuation caused by fish waste, uneaten food and addition of tap water Use for weekly monitoring and when water or fish problems appear