Don't bother.
At first, I rated this scale 5 stars, saying that it was a good value, just required re-zeroing/calibrating if moved. After about 30 attempts at calibrating it when it first arrived, it seemed accurate and consistent. But then I bumped the side of the scale, and threw it off. I have tried to re-zero/calibrate it, and I think I've tried 100 times, over the past few weeks, and I can't get it to zero out, or even be consistently off, so that I could just add or subtract lbs from the false reading. I'd say that any reading is within 10 lbs of my actual weight. 'Fraid to say, this seems to be landfill-ready right out of the factory.
Rating: 1 stars