TURBOTRONIK NT 341M/I Leybold Turbomolecular Pump Controller Tested Working. Model No: TURBOTRONIK NT 341M/I. NT341M/I, NT 341 MI. This TURBOTRONIK NT 341M/I is 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.