Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Terrible and is going straight back

This thermometer can't be used when the oven temperature exceeds 392 degrees, so if you're going to be roasting at 400 or higher, you can't use this in the oven. The magnets on the back are so weak that the thermometer just slides down the oven door and it keeps turning off every 10 minutes, so I end up having to check it anyway. I replaced the battery thinking that it was losing steam, but a brand new battery didn't solve the problem of it turning off all the time. I just checked it against another thermometer that I have calibrated properly, and there's a 20 degree difference between the two. I had really high hopes for this thing, but it's junk.