This 1942 Friez N Aero 1936 USN Barometer was used by the US Navy in WWII.  It is a portable instrument that was used to set the altimeter readings in naval aircraft. It has a 5 inch dial.   It measures barometric pressure in the range of 880 mb to 1060 mb.  A previous user has written the pressure values in inHg on the outer edge of the dial. 

​Go to the Friez catalog page.

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