Instantly know the pH of your colorless liquid. Add your colorless liquid to one of the clear vials inside this kit and add 3 drops of Biopharm Wide Range 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-point increments. This gives a much more dependable reading when accuracy matters. **Please inquire for a Certificate of Analysis/Conformance**