Check the listing for details. MKS Model 246C Single Channel Controller, Mass-Flo Controller Model 1479A13CS1AM. Condition: Used. Listed at 1950.00 USD. MKS Single Channel ControllerModel: 246C Mass-Flo Controller Model: #1479A13CS1AMRange: 1000 SCCMGas: N2 For Internal Use:Barcodes:18452627Location: 12B CHP Consultants dba CHP Surplus est. 2002 chpconsultants.com We offer 30-day return policy on our inventory. If you are not satisfied with an item, please contact us so we can work out a solution to your satisfaction. Due to the variety of the items, we sell through our store, we are only able to thoroughly test our items labeled as “Radiation Detectors”. We are happy to answer further questions on any item if we can. Please do not hesitate to message us if more information is needed. We are easy to reach during regular business hours. Monday through Friday 9-3.We take pain staking efforts to pack all items quickly and properly for safe shipping.We can consolidate shipping. If you place more than one order and wish to consolidate, simply message us prior to shipping and we can reduce shipping costs. Local pick up is available Oak Ridge, TN.We stand behind our eBay store. Check out CHPSurplus here for various miscellaneous equipment at a low price.