Bakelite Scribing Ruler with Adjustable Guide, 200 mm Scale

This bakelite scribing ruler combines measuring and marking in one tool. It has a black body, clear printed markings, and a 0-200 mm scale. The sliding adjustable guide is secured by a star-shaped locking knob. The long slotted opening supports controlled movement. Overall length is 260 mm, width 40 mm, main ruler thickness 5 mm, auxiliary ruler thickness 15 mm.