... .3.cutting head is made from 45#medium carbon steel.4.inspection criterion GB8218-2003.5.sampling standard GB8218-87 S ... accessory consists of liqiud crystal display,printed circuit board,stainless button,screw,resistor,battery and so on. 4. electrode A is direct test, electrode ... model and perfect technique to make sure your practical-ability.4.The cutter head using carbon steel,CRV,Nickel-plated ect ...