Moisture Sensing: Just flip the switch to the wet letters. You can detect the dry moisture of the soil and thus understand exactly the needs of the plants. When the needle points to the WET value, the indicator 1-3 (red part) indicates that watering is necessary, 4-7 (green part) is appropriate, 8-10 (blue part) indicates that it is too moist, please adjust according to the variety. Watering time: Lighting: when the switch is placed on the letters, it can detect the light intensity. Measurement range from 0 to 2000 lm. The higher the value, the stronger the light. Please decide whether you need shading according to the type of plants. PH Detection: When the switch is in the letter PH, you can measure the pH of the soil and thus know the status of soil fertility. Planting measures can be adjusted over time. pH 7 is neutral reaction, pH below 7 is acidic reaction, pH above 7 is alkaline reaction PLANT CARE CARE: Test soil moisture, pH and plant sun with our 3-in-1 soil tester. Makes condition recognition easy - Make sure the soil is supporting plant growth with the right nutrients. Relieves effort to take care of plants. Portable Design: Lightweight and portable design, ideal tool for testing soil conditions (moisture/light/PH) of fruits, flowers, vegetables, shrubs, etc. . Ideal for indoor and outdoor plants, so your plants grow healthy and strong.