Try square
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A try square or "Tri Square" is a woodworking or a metal working tool used for marking and measuring a piece of wood. The square refers to the tool's primary use of measuring the accuracy of a right angle (90 degrees); to try a surface is to check its straightness or correspondence to an adjoining surface. A piece of wood that is rectangular, flat, and has all edges (faces, sides, and ends) 90 degrees is called four square. A board is often milled four square in preparation for using it in building furniture. Try square is sometimes spelled "tri square". "Tri" may also refer to three purposes of this tool - 1. To check squareness 2. To check flatness and 3. To lay out lines.[citation needed]
A traditional try square has a broad blade made of steel or brass that is riveted to a wooden handle. The inside of the wooden handle typically has a steel or brass strip fixed to it that is precisely 90 degrees to the blade. Some blades have either Metric or Imperial graduations for measurement.
