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The Irrometer Watermark Meter is designed for reading Watermark sensors 200SS in the field. The digital readout displays the sensors’ soil moisture status in centibars (cb) or kilopascals (kPa) of soil water tension.


These sensors have an output of 500 – 30,000 ohms of electrical resistance which is non-linear. The meter uses a solid-state alternating current resistance bridge meter for reading the sensors and converts the resistance value into centibars (cb) or kilopascals (kPa) of soil water tension. Soil temperature values can be input by the user to compensate for their effect on sensor reading.

This value represents the energy that a plant’s root system uses to draw water from the soil. High tension values indicate drier soil and lower tension values indicate wetter soil.


The meter’s replaceable cable assembly has spring loaded clips for attachment to sensor leads.


Users only need one meter to read any number of Watermark sensors.


The meter includes a nylon case padded and zippered for safe keeping when not in use and the sensor cable.



Measurement range:  0 –199 cb (kPa)

Manual temperature compensation

CABLE: 50 OHM coaxial cable with BNC connectors on the meter end and two alligator clips on the sensor end

1 year warranty

Irrometer Watermark Digital Meter


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