Know when to water, adjust pH, or change lighting for your flowers, plants both indoor and outdoor! You can measure soil moisture, pH value and sunlight intensity. It's helpful for you to plant flowers, plants and make them grow healthy and strong.No batteries or electricity needed, plug and read.Simply insert the probes into the soil about 4-6 inches (2/3 of the probes), and you'll get your reading.Keep roots intact when you do readings thanks to the double probes design. You won't have to dig up too much soil or disturb sensitive roots when you take readings so your plants can stay perfectly healthy.