calipers
l. s. starrett 681 56693 120z 12 12 inch dial caliper
knife edge contacts for both inside and outside measurements one hand use with the thumb operated fine adjustment roll lock screw for dial bezel lock screw for holding the sliding jaw in position positive split gear anti backlash control rack teeth point down to make it easy to shed foreign matter and thereby keep the area clean sku orsno32121
l.s. starrett