Baked enamel finished frameMicro-lapped carbide tipped measuring face gives mirror finish on the measuring faces to make more accurate readingClear graduation on satin chrome finish on spindle sleeve to increase readabilityAdvanced spindle design in hardened and precision ground lead screw threads give reliable and accurate readingRotating the thimble sleeve when the inspection piece is between the spindle and anvil activate the ratchet mechanism to tap the spindle and apply uniform measuring force to the inspection piece. Also easier to use in one-hand operation and improves measurement repeatability than ratchet-stop style micrometer