A THERMOMETER IS not a new proposition. Most people own one—likely of the stick-it-under-your-tongue variety—and by many measures, it’s a simple device people rarely think about until they’ve broken out in cold sweats. So it’s strange that this year at CES, amid the drones and smart gadgets of every stripe and still more drones, one of the hottest gadgets at the show was something that reads your temperature.
