The PR4000B is a Digital Power Supply and Display module. It is available with either one or two channels, and has a 5 digit backlit LCD display as standard. Both versions support internal or external set points and master/slave control schemes. The single-channel version can control one Baratron® pressure transducer or one MKS mass flow meter or controller. The dual-channel version supports up to two pressure transducers or two mass flow controllers, or one of each.

Engineering units are user-selectable as Torr, mTorr, kTorr, Pa, kPa, cmH2O, psi, N/qm, ìbar, mbar and bar for pressure transducers; sccm, scm, slm, scfm, scfh for flow meters or controllers and V, % and °C.