Radiological Survey Meter (Geiger Counter) CDV-715 Model 1A F9F Panther WWII-era US Navy Douglas SBC

WWII-era US Navy Douglas SBC Dive Bombers as well as early 'birdcage' versions of the Vought F4U-1 Corsair Fighter

It is essentially a flight computer as it provides the navigator with the integral calculators for heading

The Type 92 was primarily used in aircraft such as the Mitsubishi A6M5 Zero fighter

a small pointer which travels the perimeter of the compass card

The knob rotates the barometric pressure adjustment

Radiological Survey Meter (Geiger Counter) CDV-715 Model 1A F9F Panther WWII-era US Navy Douglas SBCHere is an authentic Geiger Counter as used by the US Civil Defense, plus original instructions. Operational condition accuracy is unknown. With a D cell battery installed, the meter needle activates when switched on.