VICI Valco’s Cheminert Model M6 and M50 liquid handling pumps are designed for precision handling of liquids and/or gases, producing a bidirectional pulseless flow with a range of over six orders of magnitude (5 nL/min to 5 mL/min for the M6 Pump; 1 µL/min to 25 mL/min for the M50 Pump). A good fit as a replacement for syringe pumps, the Cheminert pumps eliminate the need for refill cycles and syringe changes. The M6 and M50 are positive-displacement pumps, which means they are self-priming and tolerant of any gas, which may find its way into the fluid lines. There is no separate fill cycle, and the capacity is unlimited. 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.