Instruct: Classify Amazon reviews into positive or negative sentiment
Query: If it can't accurately read the temperature, it's not much of a thermometer

I purchased this thermometer to replace my existing analog thermometer. During the holidays, I make many different candies and was looking for a more convenient way to get an accurate reading of hard crack versus soft ball stage. Being very cautious, I decided to use both the old mercury thermometer and the new digital one on the first few batches and the readings NEVER matched up, with the digital being somewhere between 15 degrees cooler or 15 degrees hotter than the analog thermometer. Obviously, this is a HUGE problem. I'll be returning the thermometer to Amazon.My 2 cents: don't buy this thermometer.