Feature: It's lightweight and portable design, convenient for indoor and outdoor use. Easy to use: This 3-in-1 moisture meter with light & ph test function don't need batteries, and you can use it indoor or outdoor. Insert probe into soil around 2-4 inches, then toggle switch to tester what you want to measure. Accuracy Reading: Moisture Range: 1-10 (1-3 Dry, 4-7 Nor, 8-10 Wet), Relative Light: 0-2000lux (0-200 Low, 200-500 Low+, 500-1000 Nor, 1000-2000 High), pH Range: 3.5-8ph (3.5-6.5 Acid, 7-8 Alkaline). Can measure soil moisture\PH degree\the strength of sunlight required for plant photosynthesis . Speciation: Material: Plastic Size: 26 x 6 x 3.5 cm / 10.24 x 2.36 x 1.38 inch (appr.) Probe length: 17.5cm / 6.89 inch (appr.) How to use: Step 1: toggle switch to moisture/ pH/ light position. Step 2: Stick the probe into the soil about 2-4 inches. Step 3: Adjust the position of the probe until the pointer on the dial swing slightly. Step 4: After 10 minutes, read the moisture/pH/light level in the dial. Step 5: Remove probe from soil and wipe clean after each use. Package included: 1 x Moisture Sensor .