... life jacket,toy,stationery,raincoat,plastic cover,purse handbag,leather strap,album and CD diso casing;kinds of medical infusion bag ... to protect electron tube and elements.4. Equipped with auto-positioning system,it is more accurate with little deciationPneumatic,hydraulic ... pressure for user to choose5. Current overload relays will auto-cutting off the high current to protect the oscillation tubes ...