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 6135-01-177-3552
NSN 6685-01-534-3725
NSN 5985-00-840-2814
NSN 5920-00-474-6125
NSN 7035-00-096-9986
NSN 6110-01-478-0116
NSN 5975-00-780-5123
NSN 6130-00-630-6370
NSN 5950-00-976-0141
NSN 6135-01-423-7502
NSN 2925-01-408-9485
NSN 6130-01-033-6410