ASTM A1038-10a Standard Test Method for Portable Hardness Testing by the Ultrasonic Contact Impedance Method*, 2023-12-21 Update
DIN 50159-2:2015 Metallic materials - Hardness testing with the UCI method - Part 2: Verification and calibration of the testing devices
DIN EN ISO 6507-2:2013 Metallic materials - Vickers hardness test - Part 2: Verification and calibration of testing machines (ISO 6507-2:2005); German version EN ISO 6507-2:2005
DIN EN ISO 6507-3:2006 Metallic materials - Vickers hardness test - Part 3: Calibration of reference blocks (ISO 6507-3:2005); English version of DIN EN ISO 6507-3:2006-03
ISO/IEC Guide 98-3:2008 Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in measurement (GUM:1995)
DIN 50159-1:2015 history
2022DIN 50159-1:2022-06 Metallic materials - Hardness testing with the UCI method - Part 1: Test method
2022DIN 50159-1:2022 Metallic materials - Hardness testing with the UCI method - Part 1: Test method