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Check the listing for details. Engineer Scale Ruler 12 Inch Aluminum Laser-Etched Triangular Drafting Tool Blue. Condition: New. Listed at 13.48 USD. Premium Material: The engineer ruler is made of high quality aluminum alloy, well-machined with smooth surface, no burrs, solid and durable. Laser-Etched: The engineer scale ruler is designed with sturdy laser-etched markings, it doesn't rub off or fade easily, ensure accuracy, quality and longevity, easy to read.