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Seeing Is Believing. Making the Invisible Visible.

Introducing the BlueSky™ 8145 Environmental Air Quality Monitor. Measure PM, temperature, RH, BP, and gases (O3, CO, CO2, NO2, and SO2) in real-time. Learn More

Get to the Source of Respirable Silica Exposure

With real-time insight collection using new application features on SidePak™ AM520 Personal Aerosol Monitor Read Press Release

TSI Wins Three OH&S Industrial Hygiene Awards

For outstanding product development in Indoor Air Quality, Respiratory Protection and Exposure Assessment categories for their ability to improve industrial hygiene Read Press Release

Are you sure they're protected?

Demand more from your Fit Test Program with PortaCount® Respirator Fit Tester Find Out More

Rediscover the Great Indoors

Poor IAQ has been linked to allergies, asthma, Sick Building Syndrome (SBS), and even reduced performance and absenteeism Learn More

Confident, Reliable Aseptic Environment Monitoring

Check out our on-demand webinars highlighting today’s hottest topics in pharmaceutical manufacturing View Now

Product Of The Year

TSI’s NEW Automated Filter Tester 8150 for in-line production testing has won in the category Innovative Product of the Year. Read Press Release

Monitor and Track IAQ plus up to 6 gases

TSI's new AirAssure™ Indoor Air Quality Monitors are available in three models, one measures 6 gases, one measures 4 gases, and one measures 2 gases - in addition to particulate matter, barometric pressure, temperature and relative humidity. Learn more...

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VelociCalc® 9600 Series Venti Meter

Guided workflows programmed for professionals allowing you to customize the instrument performance to meet your needs with the touch of a button.

SidePak™ AM520 Personal Aerosol Monitor with Respirable Silica Monitoring Enhancements

New Product Showcase

BlueSky 8145 Environmental Air Quality Monitor measures PM, temperature, RH, BP, and 5 gases (O3, CO, CO2, NO2, and SO2) all in real-time.

TSI Service

TSI is here to support you and your business: we are committed to provide you the highest standards in product service, repair and calibration.

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Quantitative Respirator Fit Testing

Ambient Air Monitoring

Indoor Air Quality

Ventilation Testing & Balancing

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Contamination Control

Share, manage, and control your devices anytime, anywhere.

Back Together Again: The Steps we have Taken and the Changes we are Making to Bring the Workforce Together after two years.

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