API TEST STRIPS,For Variety of Water Parameters,Monitor aquarium water quality and help prevent invisible water problems that can be harmful to fish,Use weekly and when problems appear,25-Count (33F)Contains one (1) API pH TEST STRIPS Freshwater and Saltwater Aquarium Water test strips 25 Count Box Monitors water quality and prevents pH problems that can be harmful to fish Dip test strips into aquarium water and check colors for fast and accurate results Helps eliminate fish stress caused by incorrect pH levels in freshwater and saltwater aquariums Use for weekly monitoring and when water or fish problems appear Tests wide range of pH levels