– Th? hi?n s? chuyên nghi?p c?a nhà s?n xu?t trong khâu ti?p th? s?n ph?m.Shroud-The comfortable iron casing encompassing the electromagnetic lenses on the TEM. Solenoid-An electromagnetic lens fashioned by copper windings with a immediate recent functioning by it.A vacuum method is employed to keep up the expected vacuum degrees through the