The PDS-100 from Fluid Metering is a programmable pumping system that uses precision stepper motors to control a variety of valveless piston pumps. It has a range from 500 nanoliters per dispense to 2 liters per minute continuous flow, and will accommodate all FMI pump sizes in both fixed and adjustable-displacement configurations. The pump heads are integrally mounted to the control unit, which is housed in a rugged anodized aluminum enclosure. The control unit includes the stepper motor drives and programmable driver electronics. The front face of the enclosure has an LED readout used to display menu-driven programming, as well as membrane switches for navigating through the programming steps. It can be configured to control either one or two pump heads. In configurations with two pump heads, each pump can be controlled independently for dual proportional dispensing and metering, or synchronized to produce a smooth, pulseless flow. 800/223-3388; www.fmipump.com.