Pfeiffer Adixen 123747 Turbomolecular Pump Controller OBC V4 Tested Working. This Pfeiffer Adixen 123747 Turbomolecular Pump Controller is used working surplus. It was tested in our facility and is fully functional. Only items pictured are included: If a part is not pictured, or mentioned above, then it is not included in the sale. Pictured test equipment is not included or available for sale. For items with multiple quantities: The pictured item is not necessarily the one that will be sent. Serial numbers or country of manufacture may vary.