Ultrasonic Thickness Gauge Base Material Steel Measuring Range 0.050 in to 7.9 in Accuracy +/-0.004 in Resolution (in/mm) 0.004/0.1 Velocity Ranges 500 to 9000 m/s Measurement Rate 1 sec. Data Storage No Cord Length 36 in Standards CE NIST Calibration Certificate Includes Ultrasonic Coolant Gel Probe Hard Carrying Case (4) Batteries Calibration Certificate