API Test Strips Freshwater and Saltwater Aquarium Test Strips 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 Desiccant lined tube provides maximum moisture protection Includes instruction booklet on how to correct unsafe water conditions