The large protractor will measure squareness of pipe ends up to 40" / 1,016 mm diameter or can be used to check large pipe miter angles up to 180º. Leg lengths of 48" / 1,219 mm and 36" / 194 mm.
The small protractor is an excellent tool for sheet metal layout, checking squareness of pipe ends up to 17" / 432 mm diameter. It has a large 18" / 457 mm leg, a shorter 12" / 305 mm leg and it is accurate to ± 1°.
The mini protractor can be used for a variety of applications including measuring bevel angle.