Calibrated Item Test   After two successful taps (Trial), the results of the test are displayed in the Output Window (Top right of the GUI) Peak Frequency (Hz) and the "Excellent" range Mean YM (GPa) between the two taps Mean Frequency(Hz) between the two Taps Standard Deviation Coefficient of variance (%) between the two Taps Density (gms/cc) To change the display units of Density and YM click on the UNITS selection window (Bottom Right corner) of the GUI.