Instruct: Classify the given Amazon review as either positive or negative.
Query: Incorrect readings after 2 uses.

I used this thermometer to check mash temperatures for homebrewing, I needed a probe thermometer to reach different parts of a 15 keg. It matched the temperature readings of my other thermometer for 2 days, and then after that constantly read at 190 - even when out in a 70 degree F basement. Resetting the power and other settings did not fix this, and there are no functions to re-calibrate.