OTOTEC Triangular Scale Ruler 30cm Black Aluminum Alloy Metric 1:20 1:25 1:50 1:75 1:100 1:150 for Architect Drafting Engineer Measuring Tools

[6 Metric Scales]: There are 3 sides with 6 scales, 1:20, 1:25, 1:50, 1:75, 1:100, 1:125, clear to read and easy for your drawing. [Dimension]: Total Scale Length is 30cm/12inch and the overall ruler length is 32cm/12.5inch. [Multifunctional Scale Ruler]: This is a multifunctional scale ruler, can be used for measuring, professional drawing, decoration design, classroom and office purposes, convenient to use for many purposes. [Durable Material]: Made of high grade aluminum alloy, rust proof, light and not easily deformed. [Ideal Gift]: The ideal measurement tools for architects, draftsmen, engineers, teachers and students etc.