ECH<sub>2</sub>O EC-5

Cover more space


Low cost individual sensors for large sensor networks

The EC-5 delivers research-grade accuracy at a price that makes large sensor networks economically practical. You can adequately characterize your site with soil moisture sensors at multiple depths and locations, even if you’re on a tight budget.

Engineered for accuracy

The EC-5 determines volumetric water content (VWC) by measuring the dielectric constant of the media using capacitance/frequency domain technology. Its 70 MHz frequency minimizes salinity and textural effects, making this sensor accurate in almost any soil or soilless media. Factory calibrations are included for mineral soils, potting soils, rockwool, and perlite.

Easy installation

Just 5 cm long with a ~0.2 L measurement volume, this handy little sensor is easy to install in the field and can also be used in nursery pots. The EC-5’s compact design makes it easy to push directly into undisturbed soil to ensure good accuracy.

Easy integration

The EC-5’s analog signal means no-hassle integration with systems manufactured by other companies.

Request a quote Contact us Knowledge base EC-5


  • Measures volumetric water content
  • Affordable: ideal for large sensor networks
  • Simple sensor with excellent accuracy
  • Small volume of influence (eg., field spatial variability, lab column studies, or greenhouse research)
  • 70 MHz frequency minimizes salinity and textural effects
  • Factory calibrations included for mineral soils, potting soils, rockwool, and perlite
  • Small size means easy installation
  • Plug and play capability
  • Easy integration with other systems
  • Use with ZL6 data logger to collect data remotely



Volumetric water content (VWC)

0.001 m3/m3 VWC in mineral soils, 0.25% in growing  media
Generic calibration: ±0.03 m3/m3 typical in mineral soils that have solution EC <8 dS/m
Medium specific calibration: ±0.02 m3/m3 in any porous medium (± 2%)

Measurement volume

See comparison article



10%–50% of excitation voltage (250–1,250 mV at 2,500 mV excitation)

Data logger compatibility

METER data loggers (ZL6, EM50/60 series, Em5b) or any data acquisition systems capable of switched 2.5–3.6 VDC excitation and single-ended voltage measurement at greater than or equal to 12-bit resolution.

NOTE: These calibration constants only apply to 2,500-mV excitation; use of these numbers with any other excitation voltage results in erroneous readings!



Length: 8.9 cm (3.50 in)
Width: 1.8 cm (0.71 in)
Height: 0.7 cm (0.28 in)

Prong length

5 cm (1.97 in)

Operating temperature range

Minimum: –40 °C
Typical: NA
Maximum: +60 °C

NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance.

Cable length

5 m (standard)
40 m (maximum custom cable length)

NOTE: Contact Customer Support if a nonstandard cable length is needed.

Connector types

3.5-mm stereo plug connector or stripped and tinned wires


Supply voltage (VIN to GND)

Minimum: 2.5 VDC at 10 mA
Typical: NA
Maximum: 3.6 VDC at 10 mA

Measurement duration

Maximum 10 ms


Manufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)

California requires the following notice:

⚠️ WARNING: This product may contain chemicals including ethylene glycol, lead, nickel, styrene and cadmium, which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov


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


Read Knowledge Base Articles