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 5985-01-317-3143
NSN 7035-00-104-7613
NSN 6150-00-683-0621
NSN 5945-01-579-7073
NSN 5945-00-226-8560
NSN 5920-00-470-2903
NSN 5905-01-347-1943
NSN 5855-01-010-4921
NSN 5950-01-483-1472
NSN 6220-01-397-2846
NSN 5950-00-861-5104
NSN 6150-01-306-7408