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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.




This Industrial Soil Moisture, Temperature & EC Sensor comes in two versions. The main difference is in the cable connector. Please choose the version that best suits your needs: 
(1) S-Soil MTEC-02B: with a waterproof aviation connector. This version saves you time in deployment as you won't have to use screws to connect the cable to the data logger. And it can be used with SenseCAP Sensor Hub 4G Data Logger instantly with ease.
(2) S-Soil MTEC-02A: with hook-up wires.



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


  • 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  

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 affect 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 in 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 moisture sensor, soil temperature sensor, and soil electrical conductivity) into one, with auto temperature compensation, this sensor ensures the accuracy of measurements regardless of the environmental 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.



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

[email protected] 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




Q: What exactly is soil moisture measured?
A: Measured is soil volumetric water content, soil volumetric water content %= soil volumetric water content * bulk density

Q: How is soil volume water content measured?
A: By measuring the dielectric constant, and then through a certain calculation formula to convert into soil volume water content.

Q: Why does the measured volume water content of soil not reach 100% in water?

First of all, the saturated water content of the soil is about 60%, and the measurement of higher water content is not of practical significance.

Second, we need to pay attention to the test environment and method when testing.

7*7*7cm square column range measured by the sensor probe. If water is used for the test, a container of at least 20*20*20cm is required, and the probe is placed in the middle (with water to immerse the probe).

The resulting value will be between 80% and 100%.

Q: How to install a soil sensor probe?

Dig a vertical hole, insert the sensor steel needle into the hole to be measured, and then compacted the pit to ensure that the steel needle is in close contact with the soil.


Is the conductivity affected by soil moisture?


The EC value can be continuously monitored in the field, mainly by measuring Bulk EC value, which is related to soil water content. If there is no water or little water content, the ions in the soil cannot dissolve in the water, and conductivity will be low.


HSCODE 9025800000
USHSCODE 9031808070
EUHSCODE 9013101000
RoHS 1



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