Feature:   1. The soil comprehensive sensor creatively measures the seven parameters of conductivity, moisture, temperature, ph, and nitrogen, phosphorus and potassium, which greatly facilitates your systematic assessment of soil conditions.   2. The sensor has high accuracy, quick response, stable output, and is less affected by the salt content of the soil. It is suitable for all kinds of soil.   3. It can be buried in the soil for a long time, is resistant to long& 8209;term electrolysis and corrosion, and uses high& 8209;density epoxy resin for vacuum potting, which can prevent moisture from entering the inner of the fuselage and has good sealing performance.   4. The probe is made of special metal material, which is resistant to rust, electrolysis, and salt& 8209;alkali corrosion, ensuring the long& 8209;term operation of the probe part.   5. It is suitable for scientific experiments, water& 8209;saving irrigation, greenhouses, flowers and vegetables, grassland pastures, soil rapid testing, plant cultivation, sewage treatment, grain storage, and measurement of various particulate water content and temperature.         Specification:        Condition: 100% Brand New  Item Type: Soil Sensor  Material: Plastic+Steel+Epoxy  Color: As shown in the picture  Size: Approx.13.8x4.5cm/5.4x1.8in  Weight: Approx.290g/10.2oz  Power Supply: 12-24V DC  Output Signal: RS485  Temperature Measurement Range: -40& 8451;-80& 8451;  Temperature Accuracy: ±0.5& 8451;  Temperature Resolution: 0.1& 8451;  Moisture Measurement Range: 0-100%  Moisture Accuracy: ±3% within the range of 0-53%; ±5% within the range of 53-100%  Moisture Resolution: 0.10%  Conductivity Measurement Range: 0-10000us/cm  Conductivity Resolution: 10us/cm  pH Measurement Range: 3-9pH  pH Measurement Accuracy: ±0.3pH  pH Resolution: 0.01pH  Measuring Range of Nitrogen, Phosphorus and Potassium: 0-1999mg/kg  NPK Measurement Accuracy: ±2%F.s  Resolution of NPK: 1mg/kg (mg/l)  Storage Environment: -20& 8451;-60& 8451;  Working Pressure Range: 0.9-1.1atm  Response Time: <1s  Protection Level: IP68  Installation Method: All buried or all probes inserted into the measured medium    Precautions:  1. All steel needles must be inserted into the soil during measurement.  2. Avoid strong sunlight directly shining on the sensor and cause excessive temperature. Pay attention to lightning protection in the field.  3. Do not bend the steel needle violently, pull the lead wire of the sensor forcefully, and do not hit or hit the sensor violently.  4. The sensor's protection grade is IP68, so the entire sensor can be soaked in water.  5. Due to the existence of radio frequency electromagnetic radiation in the air, it is not suitable to stay in the air for a long time with electricity.  6.