[4-IN-1 Soil Moisture Meter + Soil PH Meter + Soil Meter + Soil Temperature Meter] When do you need the soil meter? If you are a gardening enthusiast and want to learn more about your plants, you must thrive.When your plants grow slowly.When plants look unhealthy. [Power Meter water] Includes 9V carbon battery. It can shut down automatically without any operation in minutes. Simple, fast, accurate and time saving to test. Please install the battery before use. [3 Steps of Using Plant Moisture Meter] 1 Simply insert the sensor probe into the soil about 3-4 inches. 2 Switch the function keys to Humidity, Sunlight or pH. 3 Read measured soil levels. [Plant Moisture Meter Test Range] Plant Range Light Meter: (LOW-, LOW, LOW+, NOR-,NOR, NOR+, HGH, HGH-, HGH+) Range of the moisture meter for plants: (DRY+, DRY, NOR, WET, WET+). Soil pH tester range: 3.5-6.5 (low), 7.0 (neutral), 7.5-9.0 (alkaline). You can also use it as a soil thermometer to measure soil temperature.