El-Tronics PR-3A GM Survey Meter (1952-1955)

This GM survey meter was manufactured by El-Tronics Inc. of Philadelphia sometime in the early 1950s. 

As is the case for a number of El-Tronics GMs, the color-coded meter display changes scale in conjunction with a change in the range switch. The highest range (0-20 mR/hr) is red, the middle range (0-2 mR/hr) is yellow, and the most sensitive scale (0-0.2 mR/hr) is green).

 

 

Range:  0 - 0.2, 0 - 2.0, 0 - 20 mR/hr

Size:  ca. 5"  x  9.5"  x  6.5"

Output:  No speaker but it has a phone jack.

Batteries: Two 1.5 volt, two 45 volt "B" batteries

Reference  

Atomic Energy Commission.  Radiation Instrument Catalog No. 3. Page Date July 1, 1953. Page SGM-18C.

Museum Directory              Survey Instruments

Last updated: 12/06/11
Copyright 1999, Oak Ridge Associated Universities