FLW is the leading stocking distributor of TSI Alnor Instruments and provides a complete line of capture hoods, air velocity meters, air quality meters, air velocity transducers, air flow monitors, & more. TSI Alnor has manufactured high-quality air velocity equipment for over half a century. The TSI Alnor brand of handheld instruments is widely used by HVAC contractors, facility personnel, building engineers, safety officers and industrial hygienists worldwide. As a well known brand with years of experience to back it up, TSI Alnor has earned a reputation for quality devices.