Anti-Aircraft Artillery Range Indicator, US Navy, Mark 1, 1944 Cold War The B-7 Engine Gage Unit

The B-7 Engine Gage Unit displayed 3 metrics with one instrument:  Oil temperature (from 0-100 deg C)

The glass is clear and the lettering distinct

which told him how far he was from the point of touch-down

The knob rotates the pointer along its axis to select the desired course heading marked along the perimeter scale

This indicator

Anti-Aircraft Artillery Range Indicator, US Navy, Mark 1, 1944 Cold War The B-7 Engine Gage UnitHere is a WWII USNavy Range Indicator, Antiaircraft Gunnery, Mark 1. It is a hand held finder used to ascertain the range of an enemy aircraft based upon its known wingspan. They were only as accurate as the observers knowledge of aircraft identification and of course, how rapidly he could spot, identify, track and calculate the information to pass this on to the gunners (usually manning 20mm to 40mm guns or a 3" gun mount typically used on auxiliary