Standardgraph Tri Scale Tech School Ruler

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The Standardgraph 9412 Scale Ruler is an off white dimensionally stable plastic with 2 coloured flutings. The triangular design of the scale ruler gives a perfect grip that is vita l for accuracy when working on technical drawings. 1:20, 1:25, 1:33.3, 1:50, 1:75, 1:100 Show more