Radiological Survey Meter (Geiger Counter) CDV-715 Model 1A F9F Panther the position of a graduated

the position of a graduated card attached to the float is visible through a glass cover in the front of the bowl

The knob rotates the barometric pressure adjustment

This is an original WWII-era Course and Speed Calculator Mk II as used by aviators of the British RAF in its wooden case

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Radiological Survey Meter (Geiger Counter) CDV-715 Model 1A F9F Panther the position of a graduatedHere 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.