Use API pH Test Strips for an easy and reliable way to check pH levels in your aquarium. These strips measure pH from 6.0 to 9.0 ppm, helping you keep the water safe for your fish. The product includes a desiccant-lined tube with a snap-tight cap, a precise colour chart for accurate readings, and tips on how to fix unsafe water conditions. Suitable for both freshwater and saltwater aquariums.