The InSite-HT Eddy Current Instrument verifies proper hardness to +/-1 Rockwell hardness value at production line speeds, and also verifies case depth and material mix. The unit includes intuitive controls, menu-driven displays, built-in language selection and automatic voltage switching, and comes ready for basic bench-top or complex, multistation inline inspection that sorts parts with single or multiple defects at high sample rates. Simultaneous inspection of multiple production lines is possible with only one InSite-HT instrument. The unit is easy to integrate into new or existing production lines. The menu driven display can be used to set tolerance zones for acceptance criteria.