Protractors and angle finders are measuring tools used for finding angles in layout and setup applications as well as determining inclines. Digital and mechanical protractors include simple manual-reading protractors and bevel protractors, manual and digital miter protractors, and digital angle finders. They are read manually with a vernier scale or can be read digitally with measurements shown on an LCD. Machinist squares and sets, also called precision steel squares, are used to layout, align, and mark workpieces at 90° right angles or other common angles.