An item specifically designed to be used with a multiscale dial or sector of a measuring device to limit, open or close the observation of the scale (s), or dial (s) desired. it is usually flat and contains one or more observation slots. It may be hinged or otherwise moved by rotary or straight-line motion to expose the scale or scales required for observation.
NSN 5920-01-483-4900
NSN 5915-01-463-2465
NSN 5920-00-842-0236
NSN 5945-01-039-0643
NSN 5895-01-215-1059
NSN 6130-01-198-5876
NSN 5960-01-357-1261
NSN 6610-01-269-1894
NSN 6220-00-736-2617
NSN 5998-01-241-3799
NSN 5910-00-020-8845
NSN 5895-01-399-0240