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 2925-01-603-6379
NSN 7035-01-428-2336
NSN 5930-01-275-3009
NSN 6110-00-957-9677
NSN 6645-01-242-9699
NSN 5895-00-153-9445
NSN 5835-00-933-9609
NSN 5905-00-957-6828
NSN 5895-01-423-2275
NSN 5835-00-624-1548
NSN 5925-00-478-2290
NSN 6130-00-598-2034