Slot is 0.500 in. Lg by 0.062 in. W
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 5950-01-119-9399
NSN 6145-01-524-6075
NSN 6240-01-060-6037
NSN 5945-01-440-2065
NSN 7035-00-368-8761
NSN 6645-01-562-1351
NSN 5895-00-912-4745
NSN 5935-00-647-2846
NSN 6105-00-615-9979
NSN 6240-01-107-6413
NSN 6320-00-937-5625
NSN 6240-01-053-0666