TSI Incorporated

TSI Incorporated is a U.S.-based manufacturer of precision instruments and software used to measure, monitor, and analyze particles, aerosols, airflow, and related environmental and process parameters. Headquartered in Shoreview, Minnesota, the company serves laboratories, manufacturing sites, and field applications worldwide.

TSI’s portfolio includes aerosol and particle measurement systems (e.g., condensation particle counters, mobility and optical sizers), cleanroom and contamination control instruments for semiconductor and pharmaceutical environments, ventilation and flow measurement devices, filter and media test systems, indoor air quality and dust monitoring, and respirator fit testing equipment. Its solutions support process safety, product quality, occupational hygiene, and regulatory compliance across the chemical, life sciences, semiconductor, and environmental sectors.

Founded in 1961, TSI provides application support, calibration, and service through a global network. The company’s technologies are widely used in R&D, quality assurance, and industrial operations where accurate characterization of particles, emissions, and airflow is critical.