A Tok'ra bio-sensor used in the sci-fi series Stargate SG-1. This small round device can be seen in the series 4 episode ***8216;Upgrades***8217; when Colonel Jack O***8217;Neill (Richard Dean Anderson) and Dr. Daniel Jackson (Michael Shanks) experiment with a device that causes them to have super human abilities. The small prop is made of resin and painted purple and blue.