VICI Valco’sCheminert Model M6 and M50 liquid handling pumps support liquids and/orgases. The pumps offer a bidirectional pulseless flow with a range ofover 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 forsyringe pumps, the pumps eliminate the need for refill cycles andsyringe changes. The positive-displacement units are self-priming andtolerant of gases that find their way into fluid lines. There is noseparate fill cycle. RS-232 and RS-485 communication protocols areincorporated into the microprocessor-driven controller. (USB interfacerequires an adapter.) The included software package controls flowrates,flow direction, and metered volumes. While the standard packageincludes software and instructions to run the M6 as a stand-alone unit,the software can also integrate a multiposition stream-selection valve.