API GH & KH Test Kit

Tests tap water & freshwater aquariums for general hardness (GH) and carbonate hardness (KH).Helps prevent fish stress caused by rapid pH shifts, the result of low levels of KH. ADDITIONAL FEATURES Product Gross Weight: 0.3000 lb Product Net Weight: 0.3000 lb Product Height: 5.13 in Product Length: 2.75 in Product Width: 1.63 in INSTRUCTIONS Use Instructions: Directions for Testing KH:1. Rinse a clean test tube with water to be tested.2. Fill the test tube with 5 ml of water to be tested (to the line on the tube).3. Holding the bottle vertically, add KH Test Solution, one drop at a time. Be sure to count the number of drops being added.4. Cap the test tube and invert several times after each drop.5. The test is completed when the water in the test tube, after having been shaken, turns from blue to yellow. If you have difficulty discerning the color after the first drop of test solution is added, remove the cap from the test tube and, while holding it over a white