Newcomdigi 3-in-1 Soil Moisture Meter Soil Tester Light and PH / acidity Meter Plant Tester,Good for pH Acidity, Moisture and Sunlight Testing Usage 100% brand new and high quality Probe length: 11.7 inch Simple Testing: You can measure the soil moisture, PH, and light levels in seconds, make your plants can grow healthy and strong. No Batteries: Simply push the meter into the soil, and you'll get your reading. There's no need for batteries Indoor & Outdoor Use: Know when to water, adjust pH, or change lighting for your garden, flowers, plants both indoor and outdoor