TSI is a company that specializes in the design and production of precision measurement instruments. It offers aerosol and dust monitors, neutralizers, filter testers, flow analyzers, cleanroom particle counters, heat stress monitors, vaporizers, etc. The company caters to the healthcare, research, HVAC, environmental, manufacturing, and other sectors. TSI develops products for measurements relating to aerosol science, airflow, indoor air quality, fluid dynamics, and biohazard detection.