Truth wristband

http://www.makershed.com/ProductDetails.asp?ProductCode=MKSM1
"How it works: The sweat glands in your palms are tied into the arousal systems in your body (e.g. adrenaline) causing micro-bursts of sweating on your palms when you experience a stressful or arousing stimulus. Because sweat is electrically conductive, this leads to an increased skin conductance that can be measured and displayed by the Truth Wristband. The Truth Wristband measures stress/arousal which commonly accompanies lying. But, ask the right question and it doesn't matter what answer you get!"

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