– Th? Hello?n s? chuyên nghi?p c?a nhà s?n xu?t trong khâu ti?p th? s?n ph?m.Cold finger-A long copper rod extending together the inside with the electron column. When its reservoir is saved stuffed with liquid nitrogen, the rod draws in contaminants That may otherwise degrade the chamber's vacuum.D??i ?ây là m?t s? m?u tem decal trong su?t