MT100 multipoint thermal mass flowmeters from Fluid Components International provide temperature-compensated direct mass flow measurement of air and gases with low maintenance requirements in large-diameter pipes, stacks and rectangular duct installations. The meters are available with two to eight flow rate-sensing points, inserted at various depths within a pipe or duct. Their outputs are multiplexed and averaged to produce the flow rate within the process line. There are no moving parts or glass windows to foul or clog. They can measure air and gas processes operating at up to 850 degrees F. 800/854-1993; www.fluidcomponents.com