The new ThetaProbe has extra features, improved performance and a new look. With its 1 % accuracy the ThetaProbe continues to set the standard for soil moisture measurement but now also measures soil temperature.

The ML3 with the addition of a thermistor sensor enables the simultaneous logging of soil temperature with soil moisture. A new cabling system makes it simple to extend or replace cables. With a choice of 1 m, 5 m, 10 m and 25 m extensions, flexible configurations are now possible.

ML3 cables and connectors are buriable (environmentally protected to IP68). The ML3’s salinity response has been improved - its output has been characterised at EC values up to 2000 mS.m?1. The temperature range has also been improved with tests demonstrating that the ML3 can operate at temperatures as low as ?40 °C.


  • Soil moisture with ±1 % accuracy
  • Built-in temperature measurement
  • Adaptable cable system
  • White body
  • Improved performance in saline soils

ThetaProbe ML3 Soil Moisture and Temperature Sensor - Product sheet