The RHSY features FMI's patented CeramPump® valveless pumping principal coupled with a synchronous drive assembly. Piston stroke displacement is infinitely adjustable using a micrometer-like easy grip control ring graduated in 450 divisions. The synchronous drive provides an exceptional stroke rate accuracy independent of load variations or fluctuations in voltage, and can be stalled indefinitely without damage. The CE rated RHSY is available in 230 VAC, 50 Hz. and will meter from microliters up to 60 ml/min at 1% accuracy or better.