Instruct: Classify Amazon reviews into positive or negative sentiment
Query: don't waste your time

I bought this body fat analyzer from target after having my body fat professionally measured. No matter what I did, it always read my body fat to be 30.5%. Now, I'm no kate moss, but I'm not at 30% either! I even tried it on my overweight boyfriend and his size 0 sister, and surprise! They too both had 30% body fat! Don't waste your time buying this one, you'll jsut be returning it shortly.