Feature: 1. Easy to measure, not only for professionals, but also for non-professionals, just insert the instrument into the soil to measure. 2. High precision, fast speed measurement, accuracy up to within 2%, and increased stabilitym, more accurate data. 3. The resolution is up to 1mg/kg (mg/l), on-site quick inspection, easy to carry, and can be read by inserting into the soil. 4. Portable measurement, accurate grasp of the soil fertility status, the user can measure the soil condition at any time, according to the soil condition, the soil fertility can be balanced to achieve a suitable growth environment for the plant. 5. The sensor uses high quality chip, low power consumption, high sensitivity and stable signal. 6. IP68 grade waterproof and dustproof, to ensure the normal operation of components for a long time. Good sealing performance to prevent moisture from entering the interior of the instrument. 7. High quality probe, rust resistance, electrolytic resistance, salt and alkali corrosion resistance, to ensure the long-term operation of the probe part. Therefore, it is suitable for all kinds of soil. 8. Suitable for agricultural production, greenhouse breeding, orchard nursery, soil research. 9. It is suitable for the detection of alkaline soil, acid soil, substrate soil, seedling bed soil, coconut bran soil. Specification: Condition: 100% Brand New Item Type: Soil NPK Sensor Material: ABS Color: As shown in the picture Length(not include cable): Approx.14cm/5.5in Width: Approx.4cm/1.6in Weight: Approx.203g/7.2oz Measuring Range: 0‑1999mg/kg Working Humidity: 5 to 95% (relative humidity), no condensation Measurement Accuracy: ±2%F.s Resolution: 1mg/kg (mg/l) Baud Rate: 2400/4800/9600 Response Time (T90, seconds): less than 10 Communication Port: RS485 Working Temperature: 5 to 45 ° C Power Supply: 12V‑24V DC Protection Class: IP68 Package List: 1 x Soil NPK Sensor Note: 1. The steel needle must be inserted into the soil during the measurement.2. Avoid strong sunlight directly on the sensor and cause the temperature to be too high. Use in the field to prevent thunderstrike .3. Do not bend the steel needle. Do not pull the sensor lead wire. Do not drop or violently hit the sensor.4. The sensor protection class IP68 can soak the sensor in the water.5. Due to the exist of radio frequency electromagnetic radiation in the air, it is not suitable to be energized in the air for a long time.6. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.