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 6110-00-466-1674
NSN 6145-01-155-5277
NSN 6620-01-400-2928
NSN 5910-01-605-9524
NSN 5965-00-058-1766
NSN 5999-00-248-5328
NSN 6135-01-422-1440
NSN 6620-00-416-4131
NSN 5996-00-007-9845
NSN 5935-01-384-4594
NSN 5965-01-633-8849
NSN 5985-01-443-2417