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the scale he's talking about above does it though "bio-electrical impedence" or soemthing like that. essentially, it weighs you, and then shoots an electrical impulse through you, and based on the time it takes to get back to the pad, plus weight, gender, age, etc, uses an equation to figure out your body fat percent. it has to do with the speed electricity passes though water and how much water makes up (or doesn't) fat tissue. that's a general idea, not necessarily 100% correct.
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