Upgraded Four In One Soil Ph Meter (s1), Soil Hygrometer With Light/ph/temperature, Digital Plant Thermometer Test, Hygrometer Lamps For Gardening, Ag f74Double needle - High quality double needle detection technology improves the speed and accuracy of soil moisture and pH detection and analysis. Easy to use - no battery required. Insert the probe (at least 10 centimeters deep) into the measurement area to obtain accurate data. 3-in-1- It can measure soil moisture/pH/light, which can help you quickly obtain data. Application Area - Easy to read numerical values, tracking plant growth, widely used for plant growth, flower planting, and vegetable planting. Indoor and outdoor - easy to carry and store, making it an ideal tool kit for soil testing in homes, gardens, lawns, and farms.