Instruct: Classify an Amazon review as either positive or negative.
Query: Worst Thermometer I have ever seen

Absolutely terrible.I've received two of these thermometers, and both have very serious issues.When I received the first, I immediately tried to calibrate using an ice water bath, which should have a temp of 32 degrees F. Out of the box, this thermometer read 42 instead, which is of course what calibrating if for. Except that the calibration screw on this unit doesn't do a thing. Even then, I figured I could just mentally subtract 10 degrees to all my measurements, which although far from ideal, is still perfectly usable. But, when I measured boiling water, I got a reading of ~190 instead of 212. This non-linear inaccuracy makes the thermometer completely useless.The second unit I received had the exact same problems as the first, but with one more flaw. The diameter of the metal probe was much smaller, such that it didn't even fit snugly into the storage sleeve.Bottom line: This thermometer has some serious QC issues. I would avoid this product.