Hardness Test Block Rockwell B indentation Rockwell C indentation Knoop indentations (three) Close-up views of these Knoop indentions are provided below. taken by Jeff Thomas, November 1997
Knoop Indentions for Different Loads at 5X taken by Jeff Thomas, November 1997, with a light microscope
Knoop Indention at 20X Medium-Load taken by Jeff Thomas, November 1997, with a light microscope