Model No. 9700 series/9500 series. Features. The 9700 series digital hardness indicators are an accurate yet affordable option to replace the dial on your analog hardness tester. The 9700 series digital hardness indicators are an accurate yet affordable option to replace the dial on your analog hardness tester. The 9700 series hardness indicator gives you the complete functionality of a true digital Rockwell hardness tester with popular features such as statistics, memory, conversions to Brinell hardness scale or Vickers hardness scale, limit setting and more.