Rockwell Hardness Tester used by Monotype Corporation
Brinall Hardness Testing Machine
1918
Shore Scherascope (portable hardness tester)
1913
A portable Brinell hardness tester
Portable Rockwell hardness tester, British Rail Engineering Ltd
Rockwell Hardness Tester, c. 1930
1930
Herbert pendulum hardness tester, c. 1925
1925
Pendulum hardness tester, British Rail
1905-1910
Poldi harness tester, British Rail Materials Engineering Group
1935
Brinell type hardness tester with weights for 500 and 3
1921