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 6645-00-467-6094
NSN 5996-01-508-4599
NSN 5960-01-252-8821
NSN 6240-00-269-3346
NSN 5905-00-409-4248
NSN 5950-00-837-4468
NSN 6145-01-600-3386
NSN 5895-01-354-7601
NSN 5975-00-717-7280
NSN 6645-01-168-6348
NSN 6110-01-202-1483
NSN 5999-01-382-9776