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Non-Magnetic Classroom 100cm Plastic Ruler. This NonMagnetic Classroom 100cm Plastic Ruler is a durable and practical teaching tool designed for demonstrations in math, engineering, geometry, and classroom instruction. Made from robust 4mm thick ABS, it offers excellent toughness, resists breaking, and can withstand repeated drops in busy learning environments. The highprecision, laseretched scale features bold, easytoread markings on both the left and right sides, ensuring accuracy and longlasting clarity. Its smooth, flat edges provide clean measuring and drawing, while the raised ergonomic handle offers better control during use. Yellow finish enhances visibility on whiteboards and paper. A builtin hanging hole allows for convenient storage, making it an ideal ruler for classrooms, offices, and teaching spaces.