... technical requirements in Standard JB/T8290-1998.C,Inspection areas Can meet the 300mm in diameter less than, length is ... mobile magnetized coil,inner diameter 400mm.8,The human-machine interface control system 11,Automatic demagnetization systemAttenuation type automatic ... -phase full-wave dc,Timely set5,Circular and longitudinal can switch6,Sensitivity6.1,Sensitivity:Clear indications on test piece ...