Vintage DC Polyranger Model S by Sensitive Research Instrument Corp Wooden Box

This listing features a unique Vintage DC Polyranger Model S made by Sensitive Research Instrument Corporation. The device is untested and stored in a wooden presentation box that shows significant age wear, including tape on the handle and paint scuffs around the exterior. Inside, the instrument appears complete, though its functionality remains unknown. As a rare piece of mid‑20th-century test equipment, the Polyranger offers historical appeal to collectors of vintage electronics, lab instruments, or industrial artifacts.

Its wooden box, though worn, adds to the retro aesthetic and collector value. Such items were once used for precise DC voltage readings across multiple ranges and are now seldom found outside private collections.