WatermarkHolder_154x300 WATERMARK sensor is a solid-state electrical resistance sensing device that is used to measure soil water tension. As the tension changes with water content the resistance changes as well. That resistance can be measured using the WATERMARK Sensor. The sensor consists of a pair of highly corrosion resistant electrodes that are imbedded within a granular matrix. A current is applied to the WATERMARK to obtain a resistance value. The WATERMARK Meter or Monitor correlates the resistance to centibars (cb) or kilopascals (kPa) of soil water tension. The WATERMARK sensor is a resistive device that responds to changes in soil moisture. Once planted in the soil, it exchanges water with the surrounding soil thus staying in equilibrium with it.
Can be used with CaipoBase and CaipoWave.

Model 200SS
Dimensions 22mm x 82mm
Measurement range 0 to 239 cb (kPa)
Temp. Compensation: automatic, thermistor integrated
Interface Analog
Temperature range -40°C to +60°C

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