Wide measurement range: 5MHz probe: 0.040 to 20 of steel, 10MHz probe: 0.020" to 20 of steel (optional) Sunlight readable dot-matrix display with backlight 100K internal datalogger with export to Excel Echo to Echo option to reduce coating errors B-scan (visual cross section of test piece) Vibrates on alarm Multiple transducer options for high temperature and difficult to measure materials Fast minimum feature to capture minimum thicknesses Specifications Battery Life 50 hrs (20hrs w/backlighting) Steel Thickness Range 5MHz probe: 0.040 to 20" (1.0 to 508mm); 10MHz probe: 0.030" to 2" (0.76mm to 50.8mm Material velocity calibration range 0.200 to 0.7362in/?S (0.508 to 18.699mm/?S) Hold Mode Holds display to retain last thickness reading with reverse video display Fast Min/Max Mode Displays Min or Max and actual thickness value at 20 measurements/sec Units Inches/Millimeters/Microseconds Illuminating Keypad F1 = Red, F2 = Yellow, F3 =green for easy,go/no-go testing Datalogger Stores 50k readings (expandable to 100k) and 5,000 waveforms file names up to 20 characters long and theincluded Extech XPorter software extracts .csv data files that can be opened for viewingin MS Excel, Notepad, or Wordpad. Differential Mode Displays the difference from the actual thickness measurement and a user entered reference value. Velocity Mode Displays acoustic sound speed to measure thickness of unknown materials.