This listing is for a used Brooks MFC (Mass Flow Controller), model 5851E from the 5851E series. A mass flow controller is a precision instrument used to measure and regulate the flow rate of gases in various industrial, laboratory, and research applications. This used unit is suitable for buyers looking for a functional component for system integration, maintenance, or as a spare part. The item is available with free shipping. As it is a used instrument, its specific operational history is not detailed here. Check the listing for full details on its exact condition and any available specifications before purchase. 6682 BROOKS MFC, 5851E SERIES 5851E. Condition: Used. Listed at 209.60 USD. Part Number: 5851E. Item ID: 6682. Kindly review images thoroughly before purchasing. We will review and approve your price match request on a case by case basis. We also do not price match against sites with on-going flash sales.