ThetaProbe ML3

Measurement of soil water content

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Determination of soil water content in mobile or stationary applications (in combination with data loggers)

  • High accuracy
  • Proven for years
  • Replaceable measuring rods
  • Applicable as a mobile device or fixed in a monitoring station
  • Optional soil temperature function (only in data logger operation)
Measuring range: 0 to 50 % vol. water content

Accuracy according to producer:
Water content: ± 1 % vol. water content
Temperature: ± 0.5 °C in the range 0 to +40 °C
± 0.75 °C in the range -20 to +60 °C
Output signal: 0 to 1 V differential
Operating voltage: 5 to 14 V DC
Power consumption: 18 mA for 1 s
Operating temperature: -40 to +70 °C
Dimensions: 170 mm x 40 mm
Frequently asked questions about "soil moisture"

Our experience of > 25 years with soil moisture sensors tells us so far that almost all inexpensive soil moisture sensors have serious disadvantages. These are either a lack of accuracy or a comparatively short service life. In the worst case, both come together. We have deliberately kept our range of sensors for water content and water tension very small because, in addition to high accuracy and long service life, which we have checked ourselves, we place more value on continuity and expertise than on erratic reactions to movements in the market. Nevertheless, we are in some continuous development process with the constant improvement of our self-manufactured sensors.

Other people would call the statement of our competitor "alternative facts" ;-)

We have been demonstrably manufacturing sensors with the full measuring range pF 0-7 since 2008 until today (> 6,000 units), among our long-standing customers are many well-known institutions.
Please feel free to ask for references.