As an international leader in measurement technology for over 50 years, TSI designs and manufactures precision instruments used for indoor air quality, respirator fit testing, exposure monitoring, contamination control, aerosol research instruments, ventilation testing and other key parameters in the environment. Especially within the segment Occupational Health&Safety, TSI offers a wide product range, which includes Indoor Air Quality Monitors, PortaCount Respirator Fit Testers, DustTrak Aerosol Monitors to provide various measurement solutions for evaluating workplace risks. TSI serves the needs of industry, governments, research institutions and academia. Our UK based service department also ensures your instruments are calibrated and serviced by TSI in market leading turnaround time.