LWS-L Water Sensor

The LWS, manufactured by Decagon, can detect small amounts of water or ice on the sensor surface for leaf wetness applications. Because the LWS measures the dielectric constant of the sensor's upper surface, it can detect the presence of water or ice anywhere on the sensor's surface.
Features
Imitates characteristics of a leaf.
Does not require painting or calibration of individual sensors.
Detects trace amounts of water or ice on the leaf surface.
Low power consumption
Specifications
Measurement Time: 10 ms
Power: 2.5 Vdc @ 2 mA to 5 Vdc @ 7 mA
Output: 250 mV to 1500 mV
Expected Lifetime: 2+ years continuous use