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 6610-01-469-2408
NSN 5920-01-009-8121
NSN 5910-01-397-9937
NSN 5910-00-155-4763
NSN 6135-01-217-3292
NSN 5985-00-451-5072
NSN 5920-01-106-1137
NSN 5950-01-186-7264
NSN 5930-00-155-5917
NSN 5895-01-656-1471
NSN 5915-01-381-7661
NSN 5965-00-243-4082