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 5895-01-628-6782
NSN 2925-01-356-6017
NSN 5990-00-179-1871
NSN 6240-01-409-2465
NSN 5998-01-477-4913
NSN 5945-01-208-0796
NSN 5925-01-527-7905
NSN 6105-00-479-3830
NSN 2925-01-516-7940
NSN 5895-01-537-0432
NSN 5998-01-246-5252
NSN 5975-01-225-2409