SM-105 Soil Moisture & Temperature Probe

The SM-105 Soil Moisture & Temperature Probe uses an onboard thermistor for temperature and volumetric water content readings.  This SDI-12 sensor is engineered with one main goal in mind: Accuracy.  The small footprint and durability factor of this sensor are impressive to say the least, but the accuracy of the sensor sets it apart from all other soil probes.


  • Soil Moisture and Temperature
  • 515 mL Volume of Influence
  • Low Profile


Volumetric Water Content (VWC):


  • Mineral soil calibration: 0.0-1.0 m3/m3
  • Soilless media calibration: 0.0-1.0 m3/m3
  • Apparent dialectric permittivity (εa): 1 (air) to 80 (water)

Resolution: 0.0008 m3/m3 from 0%–50% VWC


  • Generic calibration: ± 0.03 m3/m3  typical
  • Medium-specific calibration: ±0.02 m3/m3
  • Apparent dielectric permittivity (εa): 1–40 (soil range), ±1 εa (unitless)
  • 40–80, 15% measurement


Range: –40 to +60 °C

Resolution: 0.1 °C

Accuracy: ±1 °C

Measurement Volume:

Maximum: 715 mL


Dimensions: 4.3” x 3.4” x 0.4”

Prong Length: 1.9”

Operating Temperature: -40 to 60 °C


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With satisfied customers around the world, Microcom Environmental provides turn-key, custom, and fully integrated environmental monitoring solutions. For more information or to speak with a representative, please contact us at the appropriate location.

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