Was thinking of obtaining myself a new dual temperature meter from Testo....

I stumbled across a version that has a sensor that communicates by Bluetooth or frequency instead of the old K-Type thermocouple,,,,,,,, these would be ideal on those cold nights when a freezer goes down & you have no access for a thermocouple.....

Have any of you guys used them & what are the Pros & cons you have found with them?????