Check the listing for details. Unit UFC-2050A Mass Flow Controller MFC, N2, 20 SLM, Used. Condition: Used. Listed at 225.00 USD. Unit UFC-2050A Mass Flow Controller MFC, N2, 20 SLM, Used Expert Surplus sells a variety of high tech specialty surplus items, mostly from semiconductor processing equipment. Generally, we inspect and present our items as best we can. We tend to offer new old stock, surplus, and take out parts from dismantled tools. Many of these parts are rare, and we do not generally offer technical support to use the parts, application support, or advice on how you would use this parts in your application. We are very interested in running the very best surplus program, and stand behind our parts, and sales. If you experience a problem, and you think the part is not described correctly or doesn’t meet your expectation, or application, please let us know. We will make every effort to correct the error. Listing and template services provided by inkFrog