US Patent 7299559 Construction layout and angle measurement tool

A construction layout and angle measurement tool includes opposite working sides having unique indicia for establishing angles from side edges or corners of building materials. When used with a reference line, and when attached to the workpiece, the tool allows site layout and evaluation by only one person. The tool may be mounted on vertical, horizontal, and inclined workpieces. Angles are determined and evaluated directly with the tool while avoiding mathematical computation.