This is an environmental control system indicator used in the Gemini program to monitor the quantity and pressure of cryogenic oxygen in the primary oxygen container. The container stored and dispensed oxygen for breathing and suit and cabin pressure during the period commencing two hours prior to launch and ending with the jettison of the adapter section during reentry. The indicator was located in the center panel between the command pilot and pilot. This indicator was not flown in space. Honeywell-Minneapolis Regulator Company made the artifact and NASA transferred it to NASM in 1972.
This object is on display in Destination Moon at the National Air and Space Museum in Washington, DC.