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 5895-00-542-2019
NSN 6620-01-482-9024
NSN 6135-01-110-9470
NSN 5895-00-065-9548
NSN 5990-01-493-4039
NSN 6145-01-048-6198
NSN 5930-01-472-9283
NSN 6110-00-930-9598
NSN 5915-01-212-8761
NSN 5855-01-167-2162
NSN 6105-01-582-1140
NSN 5930-01-221-8631