A precision master reference tool used as a standard for setting micrometer calipers and snap gages; also in setting up and checking comparators. It consists of a flat steel disk, or a cylinder, precision ground and lapped to size.
Classification: Drawing, marking-out or mathematical calculating instruments, nesoi
NSN 6685-01-083-8242
NSN 5985-01-554-1037
NSN 5895-00-726-4831
NSN 5920-01-327-4797
NSN 6135-00-112-8637
NSN 5996-01-337-6190
NSN 6105-01-458-3117
NSN 6220-01-391-4492
NSN 5905-00-073-1889
NSN 6645-01-028-2186
NSN 5996-01-359-9931
NSN 6110-01-597-9936