The non-destructive testing instrument mainly uses the strong penetration of ultrasonic waves and good directivity to collect the reflection of ultrasonic waves in different media, and convert the interference waves into electronic digital signals on the screen to achieve non-destructive testing. Implement a testing instrument on a material or workpiece that does not impair or affect its future performance or use. Through the use of non-destructive testing instruments, can quickly find the material or workpiece inside and surface of the shortcomings, can determine the internal quality of materials or workpieces and organizational conditions