Industrial Soil Moisture & Temperature & EC Sensor MODBUS-RTU RS485 (S-Soil MTEC-02A)


This industrial-grade MODBUS-RTU RS485 Soil Moisture & Temperature & EC Sensor features high accuracy, reliability, stability, and durability. It can be widely used in monitoring soil moisture, soil temperature, and soil EC in professional application scenarios.

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Please send email to sensecap[at]seeed[dot]cc to request any technological support for this product.

Soil moisture is the water stored in the soil. Soil temperature is the warmth of the soil. Soil electrical conductivity (EC) is the level of salts in soil (salinity). These parameters are very important indicators of soil fertility and health, which ultimately affects the plants. When there is a high soil salinity, the salt will make it difficult for the plants to consume water even though there is a high moisture level in the soil. This will ultimately "burn" the plants. Meanwhile, too much moisture in the soil is not only bad for the plants but also wastes water and adds extra burdens to our planet earth.


Plants grow best at their preferred environment, at the optimal ranges of soil moisture, temperature, and EC level. It's important for growers to get access to the data of these parameters, to get insights on what actions need to be taken to ensure plant health and higher yield.


This Soil Moisture & Temperature & EC Sensor MODBUS-RTU RS485 (S-Soil MTEC-02A) is designed with industry standards, featuring high precision and high sensitivity and durability. Incorporating three sensors (soil moistures sensor, soil temperature sensor, and soil electrical conductivity) into one, with auto temperature compensation, this sensor ensures the accuracy of measurements regardless of the environment changes.

By measuring the dielectric constant of the soil, it can stably measure the soil VWC (volumetric water content) regardless of various soil types. The measurement conforms to current international standards for soil moisture measurement.


The stainless steel probe can be permanently inserted in the soil with quick testing for long-term use. This soil sensor is IP68 rated, very robust and durable, suitable to be applied at long-term monitoring of soil moisture, temperature and electrical conductivity at scientific experiments, water-saving irrigation, gardening, greenhouses, outdoor farming, horticulture, golf turf management, forestry, precision agriculture, and other professional environmental monitoring scenarios. It can also be applied in the water, nutrient solution, and other kinds of substrates where the EC level is needed.


  • High Performance: high accuracy, reliability, and stability
  • Compact Design: 3-in-1, soil moisture, temperature, and EC sensor
  • Universal Protocol: MODBUS-RTU RS-485
  • Wide range power supply: 3.6V ~ 30V
  • Industrial-grade Robustness: IP68 rated, suitable for long-term applications
  • Widely Applicable: can be used in soil, water, nutrient solution, and other substrates
  • Strong Anti-interference: made of flame-retardant epoxy resin
  • High Durability: anti-corrosion, with excellent performance for long-term use
  • User-friendly: easy to use, install and integrate  


General Parameters
Product Model S-Temp&VWC&EC-02A
Interface RS-485
Protocol MODBUS-RTU RS485
Power Supply 3.6 ~ 30V DC
Current Consumption

6mA@24V DC

(quiescent dissipation)

Operating Temperature -40℃ ~ +85℃
Probe Material Anti-corrosion special electrode
Sealing Material Black flame-retardant epoxy resin
IP Rating IP68
Cable Length 5 meters
Installation All buried or probe into the media to be measured
Device Weight 210g
Soil Temperature
Range -40℃ ~ +80℃
Accuracy ± 0.5 ℃
Resolution 0.1℃
Soil Moisture

From completely dry to fully saturated

(from 0% to 100% of saturation)


±2% (0~50%)

±3% (50~100%)


0.03% (0~50%)

1% (50~100%)

Electrical Conductivity 
Range 0 ~ 10000 μs/cm
Accuracy ± 3%
Resolution 10 μs/cm
Temperature Compensation

Built-in temperature compensation sensor,

Range: 0-50°C


  • Water-saving irrigation
  • Scientific Experiments
  • Greenhouse Management
  • Horticulture and Gardening
  • Golf turf Management
  • Grassland Management
  • Smart Agriculture
  • Soil Testing
  • Other Environmental Monitoring Scenarios

Wiring Diagram


Please refer to the user manual for more details about the wiring diagram. 

Probe Dimensions


HSCODE 9025800000



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