Ultrasonic Wall Thickness Gage, Includes USB Cable, Thickness Measurement Resolution 0.001 in, Calibration Certificate Type NIST, Maximum Frequency 15 Hz, Standards ASTM E797, Digital Display Screen Type LCD Touchscreen, Interface USB, Wireless, Batteries Included Yes, Battery Chemistry Alkaline, Compatible Material Carbon Steel, Manufacturer Warranty Length 2 yr, Display Size 0.505 in, Battery Size AAA, Battery Voltage 1.5V, Number of Batteries Required 3, Power Source Battery