Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Every time you weigh, it's a different answer

I joined WW and met my goal, so intended to buy this scale to keep my eye on my weight gain/loss. It's easy to use, no doubt, but every time I step on the scale, I get a different reading. One time it will say 150 lbs, then one minute later, it will drop down to 135 lbs.Now I don't trust it. For me, it was a total waste of money.