SIMPLE EFFICIENT No batteries needed, plug and play. Easy to read humidity levels including ten scales. Just insert the probes into the soil about 3-5 inches, 10 above the probe to be inserted, the most accurate measured. INDOOR OURDOOR USE Soil moisture meter lets you know when to water. It is a necessary tool for outdoor and indoor plants, gardens, lawn, vegetables, etc. Compact and portable, convenient for indoor/outdoor use. VERY ACCURATEOur soil pH meter is a combination of accuracy, precision and durability. Easy to read humidity, get the reading quickly, promotes healthy plants; Color-coded reading system, from red to green. IMPORTANT TIPS 1, Do not touch the stone or hard rock ground, if the ground is too hard and dry, easy to damage the probes; 2. Design for testing soil ONLY not for water PH test; 3, after use, need to clean and wipe the probes. AFTER-SALES SERVICE- We believe in the quality of our soil test kit. If you have any problems, contact us freely and we support forever replacement with 24-hour friendly customer service.