API Freshwater Aquarium pH Test Kit contains 1 pH test bottle, instructions, capped glass test tube, and colour card for easy pH level testing in freshwater aquariums. API Freshwater Aquarium pH Test Kit test a wide range of pH levels from 6.0 to 9.0. Use the colour-coded chart to determine if your water is safe or if adjustments are needed. Then follow the recommendations to treat the water – it's that simple!