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Metallic materials. Vickers hardness test - Verification and calibration of testing machines Ingestion-build-146508 BS EN 17111 layouts aMetallic materials Vickers hardness test Part 2: Verification and calibration of testing machines Executive summary Method of verification of testing machines for determining Vickers hardness. Abstract This part of ISO 6507 specifies a method of verification of testing machines for determining Vickers hardness in accordance with ISO 6507 1. This International Standard specifies a direct verification method for checking the main functions of machine