General Hydroponics pH Test Kits make pH testing easy. Fill a test-tube halfway with the nutrient, add a few drops of pH Test Indicator, and observe the coloration of the liquid in the test vial. Many experienced growers prefer our pH Test Kit to expensive electronic meters because it is reliable and easy to use.

Directions for use:

• Fill a test-tube halfway with nutrient
• Add a few drops of the pH test indicator
• Observe the coloration of the liquid in the test vial. Use 3 drops per 5ml of solution