Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Worthless toy

Someone bought this "Laser Straight" level for me, and at first sight I was skeptical. When I used it, I found that the level wasn't at all accurate. It would be centered in one position, and then I flipped it around and the bubble was off by 3/16"! It cannot be trusted, therefore I give it the "piece of crap" rating!