Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Wildly inaccurate

I bought this product a year ago. There are times I think it is very accurate, and other times it is wildly inaccurate. I can measure the same ball twice and have two completely different readings. I have taken it to practices where other people have tried to use it for their balls. It will show a soccer ball that is blown up like a brick to be at 1/2 the correct pressure. Any more air, and the ball would blow up. If it had worked I would have loved it. Now I have to buy something else.