... the national standard GB3721-83 "magnetic powder flaw detection machine.2,This equipment should meet all the magnetic particle inspection ... magnetization coil7.1,A mobile magnetized coil,inner diameter 400mm.8,The human-machine interface control system 11,Automatic demagnetization ... manual 10,Part length capacity 0-3000 mm11,Magnetic coil inner diameter 400mm. magnetic particle inspection machine