General Hydroponics pH Control Kit

General Hydroponics pH Control Kits make pH testing easy. 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. Many experienced growers prefer these pH Control Kit to expensive electronic meters because it is reliable and easy of use. Included in the kit: test-tube, 1 oz pH Test Indicator Solution, 8 oz pH Up solution, 8 oz pH Down solution.