DIN EN ISO 6508-2-2015 金属材料.洛氏硬度试验.第2部分:试验机与压头的检验和校准(ISO 6508-2-2015);德文版本EN ISO 6508-2-2015
Metallic materials - Rockwell hardness test - Part 2: Verification and calibration of testing machines and indenters (ISO 6508-2:2015); German version EN ISO 6508-2:2015