Instantly know the pH of your clear liquid. Add your clear liquid to one of the clear vials inside this kit and add 3 drops of Biopharm pH Indicator. With a quick shake, your pH is determined. Conveniently located on the label on the indicator is a reference color chart. This wide range indicator is great for testing the pH of many solutions. Some examples are, but not limited to, drinking water, hydroponic nutrient, aquariums, rain water, pond water and many more. This product provides a wide range of pH 5.0-8.0 in half increments. This gives a much more dependable reading when accuracy matters.