I used my running partner's for months and months...then I got my body fat measured using the "pinch an inch" method and got veeeery different results...went home and still got the same reading on the hand held ( the hand held gave me a reading close to the scale one). I followed the directions exactly and would still get the same reading.
The caliper test was done by someone who has done it for many years...sooooo, I don't use the other method anymore.
Just my .02

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Dallas Women In Motion