What does a combination square measure?

A combination square is a versatile tool used in carpentry and metalworking for measuring and marking. It is specifically designed to measure angles, making it useful for checking and laying out 90-degree and 45-degree angles. The tool also includes a ruling feature that allows it to serve as a straightedge for measuring lengths, providing accuracy when marking materials.

In addition to its angle measurement capabilities, a combination square typically has a built-in depth gauge on the square's blade. This allows the user to measure the depth of holes or recesses, enhancing its functionality. The ability to assess angles and depths along with its use as a measuring ruler makes this tool particularly valuable for tasks that require precision in both layout and measurement during carpentry projects.