This impressive wrist / forearm cuff is the brainchild of Adafruit forum member and modder Stephanie, who has built a sensor platform into the fashion accessory. The device can monitor the exposure value, track your movements over GPS, measure your galvanic skin response, tell you the temperature, humidity and even doubles as a watch and flash-light. It was built around Sparkfun's Pro Micro development board and a boatload of sensors purchased from Adafruit. We might just build one ourselves with a radiation detector, so that we can live out our Pip-Boy fantasies down at the mall.