Ruler, Center Groove, 12", 1 Each

The United Scientific® Ruler, Center Groove by United Scientific is a 12 inch / 30.5 cm wooden ruler with a double bevel and a center pencil groove. It is scaled in 1/16 inch increments on one bevel and 1 mm increments on the other, with a metal edge on one side for ruling and cutting guides. It suits math, science and art classrooms that need dual-unit measuring.