Rain, freeze, and soil-moisture sensors

Every Hunter and Rain Bird residential controller has a sensor input for a rain shutoff, and many jurisdictions require one on new automatic systems. Most sensors here are normally-closed dry-contact switches that wire to the SEN terminals on any controller, regardless of brand: a Hunter Mini-Clik works on a Rain Bird ESP-TM2; a Rain Bird RSD-Bex works on a Hunter X-Core. Wireless variants add a transmitter-receiver pair to skip the long wire run.

Not sure which sensor fits your system? Our Best Rain Sensor for Hunter and Rain Bird Systems buying guide compares the four canonical residential sensors side-by-side, with controller compatibility and install steps.