The Model ST51 Series mass flowmeter from FCI - Fluid Components International provides precise air/gas flow measurement in demanding environments. The explosion-proof instrument is easy to install and needs minimal maintenance. It has no moving parts, is nonclogging and operates over a wide flow range with low-flow sensitivity. It is packaged in an explosion-proof transmitter, and the calibration is matched to the user’s actual gas composition and installation conditions. It measures with accuracy to plus or minus 1 percent, with repeatability of plus or minus 0.5 percent. 800-854-1993; www.fluidcomponents.com