The Leaf Wetness Sensor is a circuit board that has rows of parallel traces. The resistance between these traces will decrease as the sensor gets wet. The sensor has gold plated traces to keep oxidation to a minimum.
This sensor is designed for use with our Moisture Meter or our Moisture Meter Datalogger. It provides the input needed by the Moisture Meter to report leaf wetness, but it does not directly report leaf wetness itself, and cannot be used independently.