Mr. Pen- Metric Engineer Scale Ruler, Ruler, 12" Aluminum Scale Ruler, Triangular Scale, Scale Ruler for Blueprint, Triangle Ruler, Metric Engineering, Drafting Ruler, Engineering Scale

30cm Engineer Scale Designed To Facilitate The Drafting And Measuring Of Architectural Drawings, Such As Floor Plans, Blue Prints, And Orthographic Projections, Triangular Ruler Made From High Impact Aluminum, Build To Last, Engineer Ruler With Durable Laser Cut Prints For Accuracy. They Will Not Wipe Or Scratch Off Ever, Color Coded Triangular Scale For Easy And Quick Selection Of The Desired Scale, Scale: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125