3-IN-1 FUNCTIONS: 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(This soil tester CAN ONLY be used in soil, it CANNOT be used to test any liquids) EASY TO USE: Simply insert the probes into the soil about 4-6 inches (2/3 of the probes), and you'll get your reading COMPACT FOR INDOOR OUTDOOR USE: Know when to water, adjust pH, or change lighting for your flowers, plants both indoor and outdoor NO BATTERY NEEDED: No batteries or electricity needed, plug and read SCIENTIFICALLY ACCURATE: Sensitive probe could sense changes of the soil and transfer details to the conductor, displaying the accurate values for you