Detech 401A Electron Multiplier Back Catalog number: 401A Availability: In the manufacturer's stock Price on request - + Recommended G7000-20446 Extractor Lens, 6mm, for 7000B QQQ 1 671,18 € G7005-60170 RIS Probe Maintenance Kit 1 046,19 € G3170-20126 Entrance Lens Assembly (HM) 210,08 €