Detech 401A Electron Multiplier Back Catalog number: 401A Availability: In the manufacturer's stock Price on request - + Recommended G7000-20444 Extractor Lens, 3mm, for 7000B QQQ 264,09 € G3870-20448 EXTRACTOR LENS, 6MM DIAMETER 255,00 € G1099-20132 Repeller Ultra-Clean, 5973 239,89 €