Feeler Gauges, Vernier Calipers -Scale Ruler Engineering Scale Rulers Highlights Generic Brand Scale Ruler Engineering Scale Rulers Description: Engineering Scale Ruler of professional architect, ideal for measurement and engineering design. Made of environmental protection material, convenient, easy to use and carry, very durable. Good flexibility, can be used for bending measurement. It consists of 5 flexible rulers, with clear scales printed on them. 10 scales in a folding ruler: 1:10, 1:15, 1:20, 1:25, 1:30, 1:33, 1:40, 1:50, 1:75, 1:125. specification: Material: pvc Package includes: 1 set of engineering ladder rulers (pack of 2)