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The Elcometer 501 H501----1 Pencil Hardness Tester ensures that the cylindrical pencil lead can be maintained at a constant 45 ° angle and maintains a force of 7.5N (1.68lbF). Meets ASTM D 3363, ECCA T4, EN 13523-4, ISO 15184:2012, JIS K 5600-5-4 standards.