What units are feeler gauges typically measured in?

Feeler gauges are precision tools used to measure gaps or clearances between objects. They are typically measured in thousandths of an inch (commonly referred to as "mils") and hundredths of a millimeter. This measurement system is ideal for applications that require high accuracy and is particularly useful in industries such as mechanical engineering, automotive, and manufacturing.

Using thousandths of an inch provides finer resolution for measurements, which is crucial in situations where even a small variation in clearance can affect the performance or assembly of components. The metric side, measured in hundredths of a millimeter, offers compatibility with global standards, allowing for versatile application in various international contexts.

The other choices may represent various measurements, but they do not align with the current standards commonly used for feeler gauges. For instance, while millimeters and centimeters are dimensions in the metric system, they do not provide the same precision as the thousandths of an inch and hundredths of a millimeter specifically tailored for feeler gauge use.