Trek Transponder temperature probe allows monitoring of refrigeration from -25 Deg C to 105 Deg C. Attached to Trek Transponder you can avoid loss of food, catch or bait if your refrigeration fails. It is small at 23mm length so easy to insert into the fridge or freezer space to be monitored. Material is stainless steel offering long life and safety to the items being monitored. The probe is supplied with 1m cable which may be extended up to 10m. (Trek Transponder also offer a 10 input multiplexer which allows up to 10 refrigerated spaces to be monitored).