know who’s telling the truth and who’s not, instantly make sure! just ask the person you’re testing to hold their index and middle fingers against the watch’s bio-feedback sensors. with their fingers still on the sensors, ask them a question. as they answer, press the SET button once, which brings up a chart. the more bars appear on the screen, the less likely it is they are being honest. the world of high-tech spy gadgets is now available at smarthome through engaget