The ST98L in-line style mass flow meter is the flow measurement solution for virtually any gas or gas mixture in line sizes 1 to 2 inches [25mm to 50mm].1 With ST98L, FCI combines superior, equal mass thermal-dispersion flow sensing elements and precision electronics with exacting actual fluid calibration and a choice of rugged, industrial enclosures to deliver accurate, highly repeatable flow measurement and long lasting service for the most demanding processes.