A Toxyrad Gauge, also known as a Toxy-Rad Gauge or simply T-R Gauge, is a device that is worn on an appendage, much like a wristwatch on a human. It has three coloured lights on its face, along with a dial indicating the degree of danger present, based on environmental sampling: * The RED light indicates decreasing oxygen levels in the air surrounding the device. * The BLUE light indicates the presence of dangerous radioactivity. * The YELLOW light indicates that the device has detected the presence of a substance that is toxic to Humans, Dralasites, Vrusk or Yazirians.