Digital Ultrasonic Thickness Gauge Base Material Steel Measuring Range 0.040 in to 20 in Accuracy 0.004 in Resolution (in/mm) 0.001in/0.01mm Velocity Ranges 0.2 to 0.7362 in/msec (0.508 to 18.699 mm/msec) Measurement Rate 4 sec. to 20 sec. Frequency (MHz) 0.5 to 20 MHz (-3dB) Data Storage Yes Interface USB Recording Capacity 5000 Readings Cord Length 44 in Application Non-Destructive Thickness Measurements of Primarily Steel Standards IP54 NIST Calibration Certificate