It has small holes on it, so you don't have to mark your points at the side of the ruler, which causes inaccurate marking.
PRECISE SCALE AS FINE AS 0.25MM
Pro Ruler has super precise scale on it. It can be as fine as 0.25mm, making the operation more accurate.
MARK ON EDGES & CORNERS EASILY
The Right Angle Ruler's two-scale surfaces let you mark and measure on the top, edge, and corners simultaneously!