Soil Fertilizer Detector Tester Meter NPK Sensor Transmitter for Greenhouse Garden Supplies Item Type: Soil Sensor Material: ABS+ 316 Stainless Steel Color: As shown in the picture Weight: Approx.213g/7.5oz Application: Comprehensive monitoring of various soil quality, suitable for agricultural greenhouses/flower breeding/green plant cultivation/grain storage, etc. Waterproof Rating: IP68 Temperature Accuracy: ±0.5℃ (25℃) DC Power Supply: DC 10-30V Equipment Power Consumption: ≤0.5W Output Signal: RS485 signal Conductivity Accuracy: ±3% Temperature Range: -40℃~+60℃ Moisture Range: 0%~ 100% Conductivity Range: 0-20000us/cm Quick Test Method: Select a suitable measurement location, avoid rocks and similar hard objects, plan the surface soil according to the required measurement depth, maintain the original slack of the soil below, hold the sensor firmly, and insert the soil vertically. It is recommended to average several times within a small range of the measuring point. Buried Measurement Method: Dig a pit with a diameter of about 20cm vertically, and insert the sensor steel needle horizontally into the pit according to the measurement needs, and fill the pit to ensure that the steel needle is in close contact with the soil. After the sensor is stable for a period of time, continuous long-term measurement can be carried out and record. (The detailed measurement method can refer to the instruction manual)