Use API® pH Test Strips as a quick and accurate way to test the pH levels in your water. These strips measure a wide range of pH, from 6.0 to 9.0 ppm, to help you maintain safe aquarium conditions for your fish. The product comes with a tube lined with desiccant materials with a tight-fitting cap, an accurate color chart for precise water parameter readings, and information on how to correct unsafe water conditions. For use in freshwater and saltwater aquariums. Size: 25 pieces per box.