... the national standard GB3721-83 "magnetic powder flaw detection machine.2,This equipment should meet all the magnetic particle inspection ... mobile magnetized coil,inner diameter 400mm.8,The human-machine interface control system 11,Automatic demagnetization systemAttenuation type automatic ... .2,Dc sensitivity JB/T6066 according to regulations,adopts B shape standard test blocks,set 3400 A dc current, ...