they work by sending an electrical pulse through your body and based on the time/speed it takes to return to the pads, the height you input, gender, and your weight it can determine how much of your body weight is made up by fat. it has something to do with the impedence of electricity through the composition of fat. in general, they're accurate to 2-5% i think. they're a good tool to keep track of it, even if your off a bit.
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