... may be slight defects.D, Design requirements2,Main mechanical design requirements2.1 Mechanical main body frame is made of high quality ... recycling system of magnetizing suspending liquid7,Longitudinal magnetization coil7.1,A mobile magnetized coil,inner diameter 400mm.8,The ... dc,Timely set5,Circular and longitudinal can switch6,Sensitivity6.1,Sensitivity:Clear indications on test piece Model A #2 ...