Mitutoyo 146-121 Groove Micrometer, Rotating Spindle, Ratchet Stop, 0-25mm Range, 0.01mm Graduation, +/-0.01mm Accuracy, 6.35mm Dia. Flange

The Mitutoyo 146 series groove micrometer has a flanged spindle for measurement of grooves, bores, and tubes, and a vernier scale with dual graduations in metric units for taking inside dimension (ID) and outside dimension (OD) measurements. It also has a bidirectional ratchet-stop mechanism for uniform pressure during adjustment. The vernier scale on the thimble and sleeve is graduated to 0.01mm. The micrometer is made of high-grade tool steel for durability and has a satin chrome rust- and glare-resistant finish.

Micrometers are precision measuring instruments that use a calibrated screw to measure small distances. These measurements are translated into large rotations of the screw that are then able to be read from a scale or a dial. Micrometers are typically used in manufacturing, machining, and mechanical engineering. There are three types of micrometer: outside, inside, and depth. Outside micrometers may also be called micrometer calipers, and are used to measure the length, width, or outside diameter of an object. Inside micrometers are typically used to measure interior diameter, as in a hole. Depth micrometers measure the height, or depth, of any shape that has a step, groove, or slot.

Mitutoyo manufactures precision measuring tools, metrology equipment, and systems. The company was founded in Tokyo in 1934 and formed Mitutoyo America Corporation in 1963, which is headquartered in Aurora, IL.