1, pH, moisture, light 2, Measures moisture, pH in root level 3, No batteries required 3 in 1 soil ph moisture light meter FEATURES:A. Hydrometer Plant the probe shaft into the ground, at 3/4 of its length, between the pot and the plant. Then pick up the zone of color on the dial.RED 1~3Never add any water until the pointer is found in the first half of the zone. For the plants wouldn’t be too ...