ECH<sub>2</sub>O 5TM

Soil Moisture and Temperature

Engineered for accuracy


Temperature integrated with soil moisture

The 5TM delivers temperature, measured by an onboard thermistor, along with accurate volumetric water content.

Engineered for accuracy

The 5TM determines volumetric water content (VWC) by measuring the dielectric constant of the soil (or other media) using capacitance/frequency domain technology. Signal filtering minimizes salinity and textural effects, making the 5TM accurate in most soils and soilless media. Factory calibrations are included for mineral soils, potting soils, rockwool, and perlite.

Easy installation

The 5TM’s small size makes it easy to install in the field and the greenhouse. This robust sensor can be pushed directly into undisturbed soil to ensure good accuracy.

Plug and read

Get straight to the data with an Em50-series data logger. Just install the 5TM, plug it into the Em50, set the clock and measurement intervals, and start logging data. No programming required.

Easy integration

The 5TM comes standard with both serial and SDI-12 communication options, meaning easy integration with systems manufactured by other companies.

Advantages of the 5TM

  • Measures VWC and temperature
  • SDI-12 compatible
  • 715 mL volume of influence
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  • Measures VWC and soil temperature
  • SDI-12 compatible
  • 515 mL volume of influence
  • Easy installation
  • Plug and play with METER data loggers
  • Use with the EM60G data logger to collect data remotely
  • 70 MHz frequency minimizes salinity and textural effects
  • Factory calibrations are included for mineral soils, potting soils, rockwool, and perlite



Apparent dielectric permittivity (εa): ± 1 εa from 1 - 40 (soil range); ± 15% from 40 - 80

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

Temperature: ± 1 °C


εa: 0.1 εa from 1-20, < 0.75 εa from 20-80

VWC: 0.0008 m3/m3 (0.08% VWC) from 0 to 50% VWC

Temperature: 0.1 °C


εa: 1 (air) to 80 (water)

Temperature: -40 - 60 °C*

*Sensors can be used at higher temperatures under some conditions. Contact METER for more details.


10 cm x 3.2 cm x 0.7cm

Cable length

Sensors come standard with 5 m cable. Custom cable lengths available. Maximum cable length of 75 m. Please contact METER if you need longer cable lengths.

Measurement time

150 ms


3.6 - 15 VDC, 0.3 mA quiescent, 10 mA during 150 ms measurement


RS232 or SDI-12

Connector types

3.5mm "stereo" plug or stripped and tinned lead wires (3)

Data logger compatibility (not exclusive)

METER Em50/50G, EM60/60G, ProCheck, Campbell Scientific

Measurement volume

See comparison article


One year, parts and labor



Have a question or problem? Our support team can help.

We manufacture, test, calibrate, and repair every instrument in house. Our scientists and technicians use the instruments every day in our product testing lab. No matter what your question is, we have someone who can help you answer it.


Phone US: +1 509-332-5600
Phone Europe: +49 89 12 66 52 0