helix student engineer plastic triangular scale ruler 12"

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Entry level Architectural Scale perfect for the beginning student! Durable white plastic scale features easy-to-read graduations. Classic triangular shape means graduations are eas y to read from all angles. Engineer Scale features the following graduations: 1/10, 1/20, 1/30, 1/40, 1/50, and 1/60 inch. Show more