Used MKS 247C Four Channel MFC Controller and Readout with four 2159B Mass flow ControllersllMKS 247C Four Channel MFC Controller and Readout with four 2159B Mass flow Controllers The 247 4 channel, sequentially selectable simple readout is designed to control and display any flow meter or controller. The flow rate set point can be adjusted either through front panel controls or remotely through the rear panel analog interface. Includes four 2159B 00100SV Range: 100SCCM N2 gas flow meters and cables. 115V, 50 60Hz