Standard Probe- The 50' standard probe consists of a thermistor housed in a small white nylon cap on the end of a gray speaker type cable. The thermistor housing is filled with a gray epoxy and is well designed for indoor environments.

Heavy Duty Probe- The 75' heavy duty probe consists of a thermistor housed in a rugged stainless steel tubing on the end of a gray 2 wire shielded cable. The cable is surrounded by a thick weatherproof PVC material and is well suited for outdoor environments.