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 5855-01-287-6391
NSN 5950-01-642-2607
NSN 5945-00-431-5277
NSN 5895-01-622-5999
NSN 6240-00-473-6138
NSN 5999-00-137-1142
NSN 6685-01-567-8075
NSN 6150-01-338-9777
NSN 6610-01-339-5254
NSN 5999-00-296-7564
NSN 5975-01-056-5514
NSN 5910-00-239-6965