2018DIN EN ISO 4545-2:2018-07 Metallic materials - Knoop hardness test - Part 2: Verification and calibration of testing machines (ISO 4545-2:2017); German version EN ISO 4545-2:2018
2018DIN EN ISO 4545-2:2018 Metallic materials - Knoop hardness test - Part 2: Verification and calibration of testing machines (ISO 4545-2:2017)
2006DIN EN ISO 4545-2:2006 Metallic materials - Knoop hardness test - Part 2: Verification and calibration of testing machines (ISO 4545-2:2005); English version of DIN EN ISO 4545-2:2006-03