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FDR or Capacitance sensors measure the water content in the soil.

We offer an extensive range of volumetric sensors in different designs and for different applications. FDR sensors are well suited for integration into numerous data acquisition systems, including IoT systems, as they output an analog or digital standard signal. Sensors from various manufacturers are available as well as handheld readers for these sensors.

Working Principle FDR

FDR (Frequency Domain Reflectometry) sensors measure the dielectric properties of the soil between two electrodes. The readout device "checks" returning electromagnetic waves for deviations in the frequency domain and thus determines the water content in the soil.

More Info on measuring water content in soil