Easy to Use: just need plug and read. Please allow some different show between tow tester Moisture Meter for Plants:Make your plants more healthy by Soil Moisture Sensor Meter. No Battery Required:Simply push the meter into the soil, and you'll get your reading. It's no need for batteries. Both for Indoor & Outdoor Use:Easily know when to water for your flowers, plants. Scientifically Accurate:Easy & accurately to read moisture promotes healthy plants.