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 6130-01-364-3213
NSN 6620-01-557-0195
NSN 5985-01-628-6760
NSN 6645-01-185-7684
NSN 5915-01-154-4721
NSN 5935-01-595-9452
NSN 5915-01-328-7525
NSN 6620-01-200-8176
NSN 5920-01-416-4274
NSN 6150-01-548-4827
NSN 5920-01-611-6299
NSN 6645-01-487-8227