Which type of micrometer is used for measuring holes and hole features?

The inside micrometer is specifically designed for measuring the internal dimensions of objects, such as holes and hole features. Its design allows it to reach inside a hole or cavity, providing precise measurements of diameter or depth. Inside micrometers typically have interchangeable rods or extension arms, which make it easier to measure varying depths within a hole while maintaining accuracy.

Other types of micrometers serve different measurement purposes. For example, outside micrometers are used for measuring external dimensions, such as the thickness of a workpiece, while depth micrometers are focused on measuring the depth of grooves or holes. Universal micrometers can often be adjusted for multiple uses but are not as specialized for measuring inner dimensions as inside micrometers are. Thus, the inside micrometer stands out as the tool best suited for measuring holes and hole features.