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Six Essential Metric Scales on One Ruler — This triangular scale ruler features six precision-calibrated ratios: 1:20, 1:25, 1:50, 1:75, 1:100, and 1:125, covering the most commonly used scales in architectural and engineering drawings. Each face is clearly marked and easy to read, eliminating the need to switch between multiple rulers during a single project. Durable Plastic Construction — Made from high-quality rigid plastic, this ruler is lightweight for comfortable handling yet robust enough to withstand daily use in busy studio, office, or site environments. The triangular profile provides added strength and prevents the ruler from bending or warping over time. 30cm Professional Length — The full 30-centimetre length offers ample measuring capacity for standard A3 and A4 drawings, whilst remaining compact enough to store conveniently in a pencil case, desk tidy, or drawing board pocket. The graduated markings are printed clearly for quick and accurate reference. Versatile Across Multiple Disciplines — Suitable for architects, engineers, surveyors, draftspeople, and design students, this ruler supports a wide range of technical drawing tasks including floor plans, site surveys, structural layouts, and mechanical drawings. A single tool that serves multiple professional needs. Accurate and Easy to Read — The precisely etched scale markings and colour-coded faces allow for fast identification of the correct ratio, reducing errors and improving efficiency during complex drawing and measuring tasks.