it measures the impendance between your 2 feet, thus measuring the way of the least resistance and not completely taking in account the fat you might have in your love handles and/or beer belly :-)
when i measure myself in the gym , i'm 16 % fat , when I measure myself @ home , i'm between 22 - 26 %, and this can change 1 % in 5 minutes. to use it to check progress is ok, i think. but to use it as an actual measuring tool is a little unreliable.
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