The Brown & Sharpe style A Intrimik vernier inside micrometer has three-point contacts for self-centering measurement of the inside dimension (ID) of bores, and a vernier scale in inch units for taking precise inside dimension (ID) measurements.

The micrometer is made of high-grade tool steel for durability, with a satin chrome rust- and glare-resistant finish. The vernier scale is graduated to 0.0001€ or 0.0002€, depending on the model. A knurled friction thimble helps provide quick adjustment capability. The measuring faces are made of hardened steel and may be uncoated, TiN-coated, or tungsten carbide-tipped for wear resistance, depending on the model.

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.