1. Capable of performing measurements on a wide range of material, including metals, plastic, ceramics, composites, epoxies, glass and other ultrasonic wave well-conductive materials. 2. Transducer models are available for special application, including for coarse grain material and high temperature applications. 3. Probe-Zero function, Sound-Velocity-Calibration function. 4. Two-Point Calibration function. 5.Coupling status Indicator showing the coupling status. 6. Battery information indicates the rest capacity of the battery. 7. Auto sleep and auto power off function to conserve battery life. 8. Optional software to process the memory data on the PC. 9. Optional thermal mini-printer to print the measured data via RS232 port. 10. Adjust gain function ,can easy to test the cast iron material.