1970AS 1815.2:2007 Metallic materials - Rockwell hardness test - Verification and calibration of testing machine (scales A, B, C, D, E, F, G, H, K, N, T)
2002AS 1815.2:2002 Metallic materials-Rockwell hardness test Method 2:Verification and calibration of testing machines (scales A,B,C,D,E,F,G,H,K,N,T)