Scott Stein/CNET
Body Analysis: A feature in search of a good use case
Samsung’s newest health sensor on the Watch 4 is electrical impedance, a sensor technology that’s found on some home scales, and even popped up on early wearables like the Jawbone Up 3. The impedance sensor uses electrical current to estimate body water content, which is used to calculate body fat percentage, skeletal muscle mass, and body water. The app asks for your daily weight, then after a 15-second scan (which is done by holding your middle two fingers against the watch buttons while staying still), it spits out a readout of BMI, muscle mass, body fat and water mass.
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