El-Tronics PR-5A GM Survey Meter (1955-1960) |
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This is GM survey meter was manufactured by El-Tronics Inc. of Philadelphia sometime in the mid to late 1950s. Unlike the Model PR-5, which had an external probe, the GM tube of the PR-5A is located inside the case - the detector window can be seen in the lower right hand corner of the case in the above photo. The glass-walled GM tube was manufactured by RCL. Quoting a 1955 advertisement: "Three Range Portable Geiger Counter. Highly sensitive, with internally mounted G.M. tube designed for prospecting under rugged conditions! Waterproof meter. Flashlight batteries. Comes with strap. Alnico magnet earphone. Model PR-5A - $99.95."
Range: 0 - 0.2, 0 - 2.0, 0 - 20 mR/hr Size: ca. 4" x 8" x 4" Output: No speaker but it has a phone jack and a neon light the flashes of which indicate the count rate. References Atomic Energy Commission. Radiation Measuring Instruments, RIB-8 (supplement 2). July 1, 1954. Page SGM-111A. Advertisement. Saturday Evening Post. July 16,1955. Page 87. |
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