... national standard GB3721-83 "magnetic powder flaw detection machine.2,This equipment should meet all the magnetic ... C,Inspection areas Can meet the 300mm in diameter less than, length is 2540 mm of ... 1,A mobile magnetized coil,inner diameter 400mm.8,The human-machine interface control system 11,Automatic demagnetization ... -3000 mm11,Magnetic coil inner diameter 400mm. magnetic particle inspection machine