1Product Composition: Soil moisture sensor is composed of a power supply module, a transmission module, a zero drift and temperature compensation module, and a data processing module. 2Powerful Function: The sensor has built in signal sampling and amplification, zero drift and temperature compensation functions, which have little impact on soil quality and are widely used in a wide range of areas. 30100% Measurement Range: High measurement accuracy, reliable performance, quick response, good interchangeability, and high data transmission efficiency. 4Compact Design: This soil moisture sensor has a small and light appearance, which is easy to carry and connect. The cable length is about 1.5 meters, which can meet the needs of use. 5Long Lasting Use: Supports dielectric constant signal output, good sealing, IP68 protection level, can be directly buried in soil and used, not easy to be corroded or rusted. Item Type: Soil Moisture Sensor Material: ABS Weight: Approx. 141g / 5oz Probe Material: Stainless Steel Sealing Material: Epoxy Resin Measurement Parameter: Soil Volumetric Water Content Measuring Range: 0-100% Measurement Accuracy: 3% Resolution: 0.1% Measurement Area: A cylinder with a diameter of 7cm and a height of 7cm surrounding the central probe with the central probe as the center Probe Diameter: Approx. 3mm / 0.12in Response Time: 2s Cable Length: Approx. 1.5m / 4.9ft Working and Storage Conditions: Working Temperature: -40-85 Working Humidity: 0-100%RH Storage Temperature: -40-125 Storage Humidity: V: Voltage Type A: Current Type R: RS485 Type Operating Voltage 7-24V 12-24V 7-24V Working Current 3-5mA 3-25mA 3-5mA Output Signal Output Signal 0-2V DC 4-20mA RTU ProtocolRTU Protocol Communication Method: RS485 communication, transmission distance Line Color Red Line Black Line White Line Simulation Power Positive Power Negative Signal Line Color Red Line Black Line Yellow Line Brown Line RS485 Power Positive Power Negative 485A