Package List 3 x Soil Sensor 1 x Storage Box 1 x Instruction Manual​ Note 1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.​ Specification Material: ABS+Stainless SteelSize: Approx.170.5x37mm/6.71x1.46inProbe Length: Approx.65mm/2.56inWeight: Approx.820g/28.9ozBattery: DC 3.7V lithium battery 4000MAH (Built-in)Measuring Range: 1-1999mg/kg (mg/L)Resolution: 1mg/kg (mg/L)Measurement Accuracy: ±2%F.S.Response Time: <1sProtection Level: IP68Working Temperature: -20°C-60°C​ The professional soil meter is used to test the NPK of the soil to help achieve the optimal level of crop growth.High sensitivity probe, accurate measurement, stainless steel probe, the error range is reduced to 2%.The product is small and beautiful, easy to carry, convenient for indoor and outdoor use, suitable for farms, gardens and lawns.Portable measurement, accurately grasp the soil fertility status, in order to improve plant yield.LCD display, direct display of measurement data, without long waiting. It can also display the battery level.​