VICI Valco’s Cheminert Model M6 and M50 liquid handling pumps support liquids and/or gases. The pumps offer a bidirectional pulseless flow with a range of over six orders of magnitude (10 nL/min to 10 mL/min for the M6 Pump; 50 µL/min to 50 mL/min for the M50 Pump). Designed as a replacement for syringe pumps, the pumps eliminate the need for refill cycles and syringe changes. The positive-displacement units are self-priming and tolerant of gases that find their way into fluid lines. There is no separate fill cycle. RS-232 and RS-485 communication protocols are incorporated into the microprocessor-driven controller. (USB interface requires an adapter.) The included software package controls flowrates, flow direction, and metered volumes. While the standard package includes software and instructions to run the M6 as a stand-alone unit, the software can also integrate a multiposition stream-selection valve.