Womtri Soil pH Meter,3-in-1 Soil Test Kits with Moisture,Light and PH Tester for Plant,Garden (Yellow)[3 IN 1 FUNCTION DESIGN] Moisture, PH, Light, this meter tells you everything you need for better plants care. You will know what your plants need, when and why; your plants will be healthier and growing [EASY TO USE]No batteries or electricity needed. Just insert the probes into the soil about 4 6 inches, then you'll get your reading [ACCURATE AND RELIABLE] This soil tester works by sensing the moisture and chemical ions of the soil, the premium