Brown & Sharpe TESA 78.112360 Etalon Intalometer 531 Vernier Inside Micrometer, 3 x 120°, 10-12.5mm Range, 0.002mm Graduation, +/-0.002mm Accuracy

The Brown & Sharpe TESA Etalon Intalometer 531 vernier inside micrometer has three-point contacts for measurement of the inside dimension (ID) of through holes, blind bores, or short centering shoulders, and a vernier scale in metric units for taking precise ID measurements. It also has a knurled friction thimble helps provide quick adjustment capability.

The micrometer is made of high-grade tool steel and has a satin chrome rust- and glare-resistant finish. The vernier scale is graduated to 0.002mm. The measuring contacts are made of hardened steel for durability and separated by 120 degrees. The micrometer comes with a fitted case for storage.

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.

Brown & Sharpe manufactures precision measuring equipment and metrology hand tools. The company, founded in 1833, played a key role in setting industrial standards in the United States. Brown & Sharpe was acquired by Hexagon Metrology in 2001, and is headquartered in North Kingstown, RI.