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 5990-01-393-4808
NSN 5925-01-315-3806
NSN 5985-01-065-2406
NSN 5985-00-078-9631
NSN 5925-01-137-1332
NSN 6320-01-369-5014
NSN 7035-01-502-9967
NSN 5930-01-514-7023
NSN 5925-01-158-9799
NSN 5920-00-004-6372
NSN 5930-01-593-5406
NSN 5998-01-619-7388