CD V-720 Civil Defense High-Range Survey Meter (Calibrated)
0-500 R/hr range
3.75 pounds, 2-part die cast aluminum case, watertight, will float. Powered with two D-sized batteries, continuously for 150 hours, longer if on intermittent basis.
Instrument accuracy on any of its three ranges is within +- 15% of true dose rate. (It does not have X0.1 range.) Has sliding shield door on bottom to allow detection, though not measurement, of beta particles.