Can confirm 45 and 90-degree angles at the same time, and is easy to use for scribing lineCan draw a 15mm wide line necessary for areas such as a crown moldingExcellent stabilityFor testing precise 45 and 90-degree anglesFor marking the base layout of a 45-degree angle45°and 90°: Less than 0.2 mm per 100 mm±0.2 mmAluminum