The MSG1 gutter moisture sensor must be used in conjunction with the MSC1 controllerGutter moisture detection is made by the sensing grid on the bottom on the housingIt detects moisture on roofs and in guttersThe combination roof and gutter detection system provides quick detection of potentially damaging roof and gutter icing conditions
Emerson Electric EasyHeat® MSG-1 Gutter Moisture Sensor, -40 to 160 deg F