General Hydroponics® 8 oz. pH Test Indicator

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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 b e 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) Show more