3-IN-1: This soil tester combines moisture meter, pH acidity and light sensor together to provide you a comprehensive idea about the soil condition of your garden and lawn. Convenient Operation: No batteries needed, just insert the sensor probe into the soil about 2-4 inches, toggle switch to test moisture, pH, sunlight you would like to measure, then wait for a few minutes till the pointer stops swinging to get a stable reading on the scale dial. Indoor & Outdoor Design: Ideal tool to test the soil conditions ( Moisture/Light/PH) of fruits, flowers, vegetables, shrubs, etc. Lightweight and Portable design, convenient for indoor and outdoor use. Scientifically Accurate: Premium Double-needle Detection Technology strongly enhances the speed and accuracy of detecting and analyzing soil moisture and pH acidity, Easy & accurately to read moisture, PH and light levels, promote plant growth in a healthy way. Super Durable: Uses metal probe, Soil Tester Meter uses metal probe which is more durable than glass probe ( please noticed that the metal probe should be wiped clean after use to keep the probe dry and clean ) .