3 in 1 ： pH meter + humidity + light test, you can know when to water the plant, and when it has enough sun, you can also adjust the soil pH as you can to a suitable level by adjusting pH with this 3 in 1 moisture meter. EASY TO USE: This 3-in-1 moisture meter with light and pH test function don¡¯t need batteries and you can use it indoors or outdoors. Insert the probe into the soil about 5.1 to 10.2 cm, then flip the switch to test what you are measuring. Reading accuracy: pH range: 3.5–8ph (3.5–6.5 acidic, 7–8 alkaline). Humidity range: 1–10 (1–3 sec, 4–7 Nor, 8–10 wet), relative low light: 0–2000LUX (0–200, 200–500 Low +, 500–1000 Nor, 1000– 2000 High) Indoor / outdoor design: lightweight and portable, suitable for plants, flowers, vegetable gardens, potted plants and lawns Wide Range of Applications: 3 in 1 Soil Moisture Meter is the ideal soil tester for plant care, home and garden, lawn, yard. Specifications: Sample length: 20.1 cm. Distance between test tips: 1.3 cm. Diameter