The 237 is primarily used to determine the percentage of time that a surface (i.e., leaf surface) is wet versus dry. The 237 is intended to emulate a leaf surface. The measurement is made by determining the electrical resistance on the surface (a wet surface is less resistant).
The "-LC" version of this product terminates in a connector (instead of pigtails) for use with a CS110 Electric Field Meter or MetData1 Weather Station. The length of the cable is specified at the time of order.