Interesting gas flow meter built by engineers at Marshall Spaceflight Center and used in Space Shuttle testing, measuring approximately 7 x 11 x 6, with a hinged cover bearing an engraved plate with operating instructions. The meter inside is made of gold anodized metal and has a large on-off switch to the upper right with a pressure gauge at center. Three "Open/Shut" switches correspond to calibrated orifices on the reverse of the case, which are housed underneath a magnetic cover. The meter probably used pressure drop to determine flow rate. In fine condition.
