... copper, rubber, paint etc.) on magnetic metal matrix iron (such as: iron, steel, alloys and hard-magnetic steel, etc.) without damage.AT-220F ... paint, plastic, anodic oxide film,etc) on non-magnetic metal matrix iron.(Such as: copper, aluminum, zinc, tin,etc.) ... copper, rubber, paint etc.) on magnetic metal matrix iron (such as: iron, steel, alloys and hard-magnetic steel, etc.) and the thickness of ...