Coating Thickness Gage Ferrous Base Material Ferrous Metals Measuring Range 0-50 mil Accuracy +/-(3 PercentL+0.04) mil Data Storage Yes USB Interface Recording Capacity 500 NIST Calibration Certificate AA Battery Type Includes (1) Main Unit (1) Magnetic Induction Probe (1) Zero Calibration Block for Fe Probe (1) Calibration Foils (50 micronm/2mils 100 micronm/4mils 250 micronm/10mils 500 micronm/20mils 100 micronm/40mils) (2) 1.5V AA Battery (1) USB Cable and Software