XLUX T10 Soil Moisture Sensor Meter - Soil Water Monitor, Hydrometer for Gardening, Farming, No Batteries Required WARRANTY-- 18 months after the date of purchase, we take care of all quality-related issues with a REPLACEMENT or REFUND EASY TO READ: Large dial, including ten scales HOW TO USE -- No batteries needed, Indoor or outdoor use. Simply insert the probes into the soil about 3-4 inches, and you'll get your reading Ideal tool for indoor/outdoor plants, help your plants grow healthy and strong. IMPORTANT TIPs --1, Do not use it to test water. Do not touch the stone or hard rock soil, if the soil is too hard and dry, easy to damage the probes. 2. Never use it to test liquid. Designed for testing soil ONLY. 3. After use, please wipe clean the probe.