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 5930-01-484-9950
NSN 6130-00-725-6913
NSN 5975-00-332-7221
NSN 6145-01-437-7086
NSN 5915-00-519-5961
NSN 5835-00-473-1010
NSN 4140-00-904-3438
NSN 6650-01-469-5651
NSN 7035-01-537-7787
NSN 6685-01-328-7691
NSN 2925-00-139-8309
NSN 5915-01-542-5260