Kíváncsivá tett a dolog engem is, de egyelőre csak ennyit találtam:
"Available in countless models, body-fat scales use a technology called bioelectrical impedance to estimate how much body fat you have. When you step on sensors on the scale, an imperceptible electrical current passes up one leg, across the pelvis and then down the other leg. Because it contains much more water, muscle conducts electricity better than fat does, so the greater the resistance, the more body fat you have. The scales use formulas to calculate a body-fat percentage from this resistance information, along with other data that you enter (height, weight, age, gender)."
Nem tudom, hogy a többit hogyan méri/kalkulálja, de elvileg van benne 4 db "human body sensor"...
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