MKS 1179A-22628 Mass-Flo Mass Flow Controller (Gas: AR, Range: 2 SCCM). Unit is used with minor cosmetic issues. See pictures, comes as shown. 

Pulled working from a decommissioned Fischione 1010 Low Angle ION Milling and Polishing System.

Info on controller:
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cyberjoes
220 2nd St NW
Fayette, AL 35555