The Brown & Sharpe TESA Isomaster standard outside micrometer has a vernier scale in inch units for taking precise outside diameter (OD) measurements, a friction drive thimble mechanism for uniform pressure during adjustment, and tungsten carbide faces for wear resistance.

The micrometer’s frame is heat-insulated to help reduce temperature-related expansion or contraction. The vernier scale on the thimble and sleeve is graduated to 0.0001”, with slanted markings on the barrel to help reduce parallax errors when reading, and a satin chrome rust- and glare-resistant finish. The spindle and anvil have flat measuring faces and are carbide-tipped for wear resistance. A spindle lock helps provide secure locking of the measurement position. The micrometer comes with a plastic 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.