... aviation ,railway ,industrial and mining enterprises in the field or on-site. It is a multi-functional, practical, high Cost- ... Clad Steel, Metals such as Wire Rod Production Line on-line and off-line nondestructive testing3,Nondestructive testing such as Oil casing, sucker ... 60dB, adjust the volume of 1dB / file4, Band-pass filter or the speed of matching5, All-digital computer parameter adjustment6 ...