Instruct: Classify a given review as either positive or negative.
Query: Worked well for about an hour

I liked it well enough but, like another reviewer here, I was using it to monitor a beer mash (water and barley at about 153deg.F)and it gave out after less than an hour. Without changing anything, the temperature suddenly went from 153 to 280. It read the air temp as 210. Kudos to Amazon for a very easy return procedure. I'll give the thermometer one more chance, but next time it is a refund for me.