The Campbell 237 leaf surface humidity sensor adopts a leaf like design and is used to measure the relative humidity of plant leaf surfaces. It measures the humidity of the surrounding environment by detecting changes in the internal resistance of the sensor caused by changes in dry humidity in the environment. The product is not sprayed at the factory and is determined by the user based on the specific usage environment to simulate the blade situation to the greatest extent possible.

The cable used by the sensor is covered with thermoplastic rubber, which can effectively prevent adverse effects of extreme temperature, humidity, ultraviolet radiation, etc. on the measurement.