Instruct: Classify a given review into positive or negative sentiment.
Query: Don't waste your money

I bought one of these about a year ago - tested it in boiling water - it registered 160. Tested it in a 350 oven. It registered 240. Contacted the company, which was also difficult. They weren't very nice at all, but finally agreed to send me another one. I tested the second one in boiing water. It registered 190. In a 350 oven, it registered 275. (Now, I see they're selling them at 2 for the price of one.) I ended up buying another brand and while it wasn't perfectly exact, it was close enough.