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 5905-00-793-9106
NSN 6650-00-391-8404
NSN 6220-01-634-0660
NSN 5835-00-901-4932
NSN 5835-01-373-9506
NSN 5999-00-217-9976
NSN 5998-01-439-9108
NSN 6110-01-649-3390
NSN 5855-00-149-0766
NSN 5925-00-808-2017
NSN 6240-00-314-8042
NSN 6610-00-684-7683