Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Did it's job well, Now it's out of a job

This unit was able to tell me if my 1980s refrigerator was wasting too much energy. Suprisingly it wasn't, and I was able to find other sources of power waste. I don't have much of a use for this item anymore though, but it was good to find that out. Next, I am going to sell it.