Grizzly G9645 Hardness Tester Depth of throat: 5-1/4-Inch; Initial range load : 10; Load range : 60 100 150; Maximum load : 150; Maximum test height: 4-1/4-Inch Initial range load : 10 Load range : 60 100 150 Maximum load : 150 Maximum test height: 4-1/4-Inch