Product: Soil Hygrometer Feuchtigkeit Feuchtesensor Bodenfeuchte Sensor mit Relaismodul Features: - This module can control humidity of soil in a wide range and set control threshold by adjusting potentiometer. When humidity is lower than the set value, relay is energized; when humidity is higher than the set value, relay is dis-energized. - High quality soil moisture sensor has nickel plating surface, widened induction area, can improve conductive performance and prevent rust problem when contact with the soil to prolong service life.
eBay