Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Piece of Junk

The scale was off by almost two degrees. I contacted Starrett and thoroughly discussed the problem with them. I sent the Protractor to them and they sent another one to me which was not correct either. I called Starrett again but couldn't get a guarantee that if I sent the second Protractor to them that I would receive one which was correct. The scales are a self sticking plastic that cannot be correct if they are off center when put on. This is another nice idea that hasn't been thoroughly thought out for production.