Soil Moisture Sensor (with Screw Terminals) can be used to measure the moisture in the soil and similar materials. This easy-to-use soil moisture sensor has two large, exposed pads that function as probes for the sensor, together acting as a variable resistor. The more water in the soil, the better the conductivity between the pads. This results in a lower resistance and a higher SIG out. The sensor includes a 3-pin screw pin terminal pre-soldered to the board for easy wiring and setup.