3-IN-1 FUNCTION: Not only for testing soil moisture but also for soil pH value and sunlight level of plants.You can make it easier to take care of your plant with the data you get from our soil meter MORE ACCURATE AND LARGER SCREEN: Double-needle enhances the speed and accuracy of soil moisture and pH you want to know.Larger screen make it easier for you reading the value NO BATTERY NEEDED and EASY TO USE: 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 5-10 minutes till the pointer stops swinging to get a stable reading on the scale dial COMPACT FOR INDOOR OUTDOOR USE: Portable and easy to carry to anywhere you want .Know when to water, adjust pH, or change lighting for your flowers, plants .Refuse to be a killer of plants, promote your plant growing in home , garden, lawn or farm etc IMPORTANT TIPS --Do not use it to test water/Do not touch the stone or hard rock soil/Never use it to test liquid. Only for soil testing / Please wipe your probe clean after everytime using