Metallic materials. Knoop hardness test - Calibration of reference blocks Ingestion-build-50790 This part of ISO/IEC 19794

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Metallic materials. Knoop hardness test - Calibration of reference blocks Ingestion-build-50790 This part of ISO/IEC 197941 Scope This document specifies the method for the calibration of reference blocks to be used for the indirect verification of Knoop hardness testing machines as specified in ISO 45452. The method is applicable only for indentations with long diagonals 0,020 mm.