Soil Moisture, Temperature, and Electrical Conductivity GS3 (LoRaWAN)

Soil sensor 3GS 900px.png
Soil sensor 3GS 900px.png

Soil Moisture, Temperature, and Electrical Conductivity GS3 (LoRaWAN)


LoRaWAN compatible sensor device

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Live demo (LoRa)

GS3 Ruggedized Soil Moisture, Temperature and EC

The GS3 soil moisture, temperature, and EC sensor is built with an epoxy body and stainless steel needles. The internal circuitry is the same cutting edge design that you'll find in other Decagon soil moisture sensors, but the form factor has been optimized for use in soilless substrates or harsh environments, giving it a wider range of EC measurement and an increased temperature range. Not only do the steel needles improve sensor contact, but they also improve the sensor's ability to measure EC in porous substrates such as peat or perlite. 

Accuracy at a Fraction of the Cost

The GS3 measures water content, temperature, and EC independently. Its 70 MHz frequency minimizes salinity and textural effects, making it accurate in most soil or soilless media. Stainless steel needles have an extended surface area to optimize EC measurements, while minimizing substrate disturbance during insertion. Temperature is measured with an onboard thermistor, and electrical conductivity is measured using a stainless steel electrode array.

Advantages and Use of the GS3

  • Measures: volumetric water content, dielectric permittivity, temperature, electrical conductivity
  • Volume of influence: 160 mL
  • Measurement range: 0 to 100% VWC
  • Temperature range: -40 to 60°C
  • Best if: You are measuring water content of soilless substrates. You need high accuracy EC. Manage salts.
  • But not if: You are installing sensors down bore holes.



  • Apparent Dielectric Permittivity (εa): ± 1 εa (unitless) from 1 - 40 (soil range), ± 15% from 40 - 80

  • Soil Volumetric Water Content (VWC): Using a generic calibration: ± 0.03 m3/m3 (± 3% VWC) typical in mineral soils that have solution electrical conductivity < 10 dS/m; using medium specific calibration, ± 0.01 - 0.02 m3/m3 (± 1 - 2% VWC) in any porous medium

  • Electrical Conductivity (EC): ± 5% from 0 to 5 dS/m, ± 10% from 5-23 dS/m

  • Temperature: ± 1°C

Note: Temperature measurement may not be accurate if sensor is not fully immersed in the medium of interest, due to excessively long equilibration time. 


  • εa: 0.1 εa (unitless) from 1 - 20, < 0.75 εa (unitless) from 20 - 80
  • VWC: 0.002 m3/m3 (0.2% VWC) from 0 to 40% VWC, 0.001 m3/m3 (0.1% VWC) > 40% VWC
  • EC: 0.001 dS/m from 0 to 23 dS/m
  • Temperature: 0.1°C


  • εa: 1 (air) to 80 (water)
  • EC: 0 - 25 dS/m (bulk)
  • Temperature: -40 to 60°C*

*Sensors can be used at higher temperatures under some conditions.

Operating Environment

-40°C to 60°C

Cable length

Sensors come standard with 5 m cable.

 Sensor dimensions

9.3 cm x 2.4 cm x 6.5 cm