try square

[PussyCat]

a square having a metal ruler set at right angles to another straight piece

[juan98]

A tool used to measure if a piece of wood is at right angle.

[Magaret]

A try square is a woodworking or a metalworking tool used for marking and measuring a piece of work. It consists of two parts - a broad blade (ruler) and a stock (handle) that is fixed at a right angle to the blade. This tool is used to check the accuracy of right angles, to mark lines at right angles, and to test the straightness of edges or flatness of surfaces.