MIL-T-4638B, MILITARY SPECIFICATION, TESTERS, MATERIAL HARDNESS (ROCKWELL TYPE) (15 FEB 1985)

MIL-T-4638B, MILITARY SPECIFICATION, TESTERS, MATERIAL HARDNESS (ROCKWELL TYPE) (15 FEB 1985)., This specification covers requirements for hardness testers for testing the hardness of ferrous and nonferrous metals.