4 in 1 Soil Meter: test soil temperature, air temperature and sunlight level, with 3 Functions Plant Meter can test soil more portable, clear reading dashboard and quick response. Reliable and accurate: Sensing probe ensures accurate and instant testing results, matching for both indoor or outdoor use. Accuracy of temperature is one degree. How to use: Simply insert the temperature meter into soil, then press power button and you'll get the test result instantly. Help your plants grow healthy and strong. Widely used: Suitable for both indoor & outdoor, garden, farm, greenhouse, potted plants, succulents. With the 8.67long probe, also great for large potted plants. Lightweight and Portable -- ideal soil test tool for indoor and outdoor use.