Body Media's Sensewear armband measures your internal information for medical and fitness. Unlike other heart rate monitors it only needs to be attached on your upper arm. The Sensewear also uses heatflux and galvanic skin response to measure how far you've travelled, exactly how many calories you're burning, and can even tell when you're sleeping!

Luminetx was also there showing their device to see your internal veins on the outside.
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