What does a dial indicator measure?

A dial indicator is a precision measuring tool used primarily in mechanical and engineering applications to measure small distances and part movement. It provides a visual representation of movement, typically displaying measurements on a dial. The most common unit for measurement with a dial indicator is thousandths of an inch (also known as "mils"), which allows for precise calibration and monitoring of minute changes in the dimensions of parts or components.

The use of thousandths of an inch is significant in industries where precision is paramount, such as in automotive and aerospace applications. It enables technicians and engineers to ensure that components meet exact specifications, which is crucial for the proper functioning of machinery and equipment.

Other units of measurement, such as millimeters, centimeters, and inches, are less commonly associated with dial indicators in the context of high-precision applications. While these measurements may be used in other contexts, they are not the standard for dial indicators, which are predominantly calibrated to display measurements in thousandths of an inch for detailed and accurate assessments.