Gamma Dose Rate Meter | Vintage Heat Pipe Corp. of America IM-179/U Radiacmeter
Modern prop collectors on communities like Ghostbusters Fans substitute them using a 2CR-1/3N or A28PX alkaline battery for the 5.2V slot, and an A640PX or V640ALK for the 1.34V slot. Military Origin: Designed during the height of the Cold War (1950sā1960s), this device was built exceptionally small (about 2.5ā x 4.25ā) to tightly fit inside USAF Aircrew survival kits.