WaterScout SM 100 Soil Moisture Sensor

The WaterScout SM 100 Soil Moisture Sensor combines affordability and accuracy into a sensor that is easy to install. The sensor is composed of two electrodes that function as a capacitor, with the surrounding soil serving as the dielectric. An 80 MHz oscillator drives the capacitor and a signal proportional to the soil’s dielectric permittivity is converted to an output signal that is then converted to volumetric water content.