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 5998-01-489-5309
NSN 6135-01-423-3915
NSN 5930-00-223-3208
NSN 5945-01-305-3776
NSN 6220-01-135-6092
NSN 5835-01-163-4215
NSN 5915-01-468-6362
NSN 5960-00-911-3422
NSN 5835-01-492-3143
NSN 2925-01-327-3069
NSN 6240-01-501-2830
NSN 6240-00-449-6003