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An professional quality aluminium Architect Scale Ruler for engineers and drawing & rendering plans from full size building structure , this hand tool is ideal for measuring ruler for scale drawing / drafting of building plans such as floor plans and orthographic projections lines for example also ideal as a engineers ruler.These hand scale rulers, the three sided scale size triangular 3D shape allow you to grip easy. the scale size are Measuring reduction the following measurement graduations Scales 1:100, 1:125, 1:50, 1:75, 1:20, 1:25 measurement scales, These tri scale Rulers are used by engineers and technical students while they practice and an ideal scale ruler for plan drawing with this straight edge brand new architect Sided Ruler.