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 6685-01-576-8045
NSN 5855-00-688-9954
NSN 6685-01-462-1164
NSN 6130-01-500-2359
NSN 6620-01-353-9224
NSN 5905-00-814-7994
NSN 5835-01-342-7975
NSN 7035-00-104-7613
NSN 7035-01-260-9543
NSN 5996-01-094-9754
NSN 6130-01-099-3411
NSN 7035-01-596-5381