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 5895-00-968-1488
NSN 5915-00-848-6638
NSN 6620-01-136-5492
NSN 5990-00-705-4350
NSN 6150-01-442-3504
NSN 6320-01-521-1764
NSN 6685-01-397-8694
NSN 6620-01-145-1278
NSN 6220-00-782-0900
NSN 4140-01-536-6054
NSN 6240-00-553-8891
NSN 5960-01-613-6122