TOWASOIL EC is an encapsulated Soil Probe. It is precision multi-function and multi-level sub-surface instruments offering continuous reliable and repeatable monitoring of soil moisture, temperature and salinity (EC).

With salinity and temperature compensated moisture readings, the probe provides accurate data for better irrigation and fertilizer decision-making

  • Sample more soilsensors are uniquely designed to have a much larger field of influence than other capacitance probes
  • Compensated measurements: compensate salinity and moisture measurements for variations in temperature, as well as compensating moisture measurements for over-read error caused by salinity.
  • Designed to last; so it is encapsulated to ensure maximum immunity to environmental degradation.
  • Maintenance-free – Each probe is individually calibrated in the factory, so they never need to be re-calibrated in the field.
  • Over 20 Years of proven excellence.


Sensitivity (per probe)

as a function of sampled volume

Total Soil Volume Detected 4 Sensors

6.4 litres

Total Soil Volume Detected 8 Sensors

12.8 litres

Moisture resolution


Salinity resolution

0.001 dS/m

Temperature resolution

0.01 °C

Moisture accuracy

+/- 2% @ 0% VWC to 50% VWC

Useablesalinity range

0 to 6 dS/m

Salinity accuracy

+/- 5% @ 0-4 dS/m at 10%-30% VWC

Temperature accuracy

+/- 1 °C @ 25 °C



Sleep current

0.45 mA – 0.90 mA max

Idle current

7 mA – 14 mA max

Active current (not sampling)

32 mA – 39 mA max

Active current (sampling)

72 mA – 79 mA max

Active time / sampling time

380 – 760 ms


33.5 mm +/-0.2 mm

Field of influence

55 mm from wall of probe