Check the listing for details. Sensitive Research Instrument Corp. Polyranger Universal DC 1954 Vintage. Condition: Used. Listed at 65.00 USD. Discover the Poly-Ranger Universal DC meter circa 1954, a vintage masterpiece by Sensitive Research Instrument Corp. This piece represents a storied era of precision engineering and scientific innovation. Made in the United States, it offers a glimpse into the meticulous craftsmanship of the past while providing the functionality sought by collectors and enthusiasts alike. This instrument comes without custom modifications, preserving its original design and integrity. Whether for display or for use in specialized applications, the Poly-Ranger is a testament to the enduring quality and reliability that Sensitive Research Instrument Corp. was known for. Add a touch of history to your collection with this classic research tool.