Mitutoyo: 103-179 (103-179H) 2-3" O/S Micrometer Enamelled Frame - Ratchet Thimble Economy type with carbide tipped anvils. Flatness: 0.6mm for up to 300mm (12"). 1.0mm for up to 300 - 500mm (12 - 20"). Parallelism: 2+L/100)mm (fraction rou…View more