General Hydroponics® 8 oz. pH Test Indicator

General Hydroponics® pH Test Kits make pH testing easy. The General Hydroponics pH Test Indicator can help you maintain an ideal pH level (which is between 5.5 and 6.5). This can be achieved by monitoring your pH using the super concentrated drops found with the test indicator. Simply fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator and observe the coloration of the liquid in the test vial. Use 3 drops per 5ml of solution. Add pH DOWN (Acid) to lower pH. Add pH UP (Base) to raise pH. pH Test Kit includes: Sampling tube Reagent Color comparison chart right on product label Additional Information: pH Test Kit MSDS (PDF)