Detectron Corporation Model DG-7 Geiger Mueller Survey Meter (ca. 1950-1960) The Model DG-7 GM survey meter was produced by the Detectron Corporation of North Hollywood, California. The company was founded (ca. 1949-1950) by Larry Cassingham and Jack Rondou. Rondou suggested that they call their new company "Detectronics" but Cassingham thought the name was too long and shortened it to "Detectron." As an advertising flyer for the DG-7 noted, it was "the ultimate in low-cost light-weight all-purpose Geiger Counters"..."tropicalized, fungus resistant and waterproof" and "very satisfactory as a laboratory instrument, for industrial monitoring, and for use as a civil defense monitor in decontamination procedures." Detector: Thin-wall GM tube Range: 0-0.2, 0 -2.0, and 0-20 mR/h Audio: No speaker but connections for headphones Size: 3.25" x 6.5" x 5.25" Batteries: Two 45 volt, two 1.5 volt and one 15 volt Price: $150 (in 1950!) Since Detectron was located in North Hollywood, it was only natural that their instruments were used in a number of motion pictures, e.g., The Brain from Planet Arous. In fact, Larry Cassingham, the company president, served as the Technical Director for a number of films, e.g., Zombies from the Stratosphere with Leonard Nimoy and The Atomic Kid starring Mickey Rooney. This really cool vintage device comes with a vintage carry case and the other items pictured. This would be a really nice addition to your collection and great as a display piece! We take our reputation seriously, we buy and sell online, so we understand the value of trust! Thanks for looking at our listing and supporting our small family business! SHELF: 40