The ProSeries-M M-4 peristaltic metering pump from Blue-White Industries has feed rates from 0.002 to 158.5 gph. Smooth, quiet, low-velocity injection eliminates destructive forces, and there is no need for pulsation dampeners or piping system repairs. It has CNC-machined squeeze rollers and two alignment rollers for optimum squeeze and tube life. The single-piece, heavy-duty rotor means no flexing and increased accuracy with no metal springs or hinges. It has a 10,000-1 turndown ratio with high-resolution motor speed adjustment. 714/893-8529; www.blue-white.com.