... tester.Miniaturization of Rockwell hardness tester, the smallest model weighs only 0.8kg and the operation is similar to that of a ... , HRB, HRA,etc.15 scales.Accuracy:Meets requirements of ISO6508Resolution:0.5HR Application:All metals, including steel, casr iron, alloy, titanium ... (inch), the second number means the opening depth(inch), if only one number it means the width and depth are the ...