Contamination Control Innovation Hub
About Particle Measuring Systems (PMSĀ®)

Leading the Way in Contamination Monitoring & Cleanroom Solutions Worldwide

Particle Measuring Systems partners with clean manufacturers around the world to help meet regulatory requirements, improve product yield, and maintain process integrity.

Particle Counter Calibration and Service
Global expertise

Trusted worldwide for contamination monitoring innovation

With a local presence in every major market, we deliver contamination monitoring solutions for particles and molecules across air, gas, chemicals, and deionized water, along with active air microbial samplers.

As the inventor of laser particle counting, our legacy of innovation is backed by over 60 active patents, making us a trusted leader in cleanroom and process monitoring technologies.

Discover What’s Driving the Future of Particle Measuring Systems

Join Andy Cowan, President of Particle Measuring Systems, as he shares his vision for the company’s future and what sets PMS apart as an exciting place to work and collaborate.

From rapid global growth and long-term customer partnerships to bold investments in innovation and infrastructure, get an inside look at how PMS is expanding its reach.

world map of PMS service and sales locations and distributors. blue

Global Expertise, Local Support—Wherever You Are

At Particle Measuring Systems, we don’t just serve global markets—we’re directly present in them.

  • Local sales and service teams in over 50 countries
  • Direct presence in every major clean manufacturing region
  • On-the-ground expertise for faster, more responsive support
  • Deep understanding of regional industry and compliance needs

Backed by more than 60 active patents and a team of 700 employees worldwide, we develop the technology that helps you make confident, data-driven decisions, boost process yield, and stay ahead of evolving regulatory demands.

We stay closely connected to industry and technology trends so you can focus on what matters most: product quality and compliance.

How Aerosol Particle Counters Work
Laser Particle Counters

Innovation That Started It All

Particle Measuring Systems is the world’s largest manufacturer of particle counters—and it all began with a breakthrough: we invented laser particle counting technology. This innovation revolutionized contamination monitoring by delivering precise, reliable data for cleanroom environments.

Since 1972, we’ve continued to lead the way. Our commitment to advancing detection technologies drives every product we release and every service we offer—always focused on solving the toughest challenges in critical industries today and preparing you for tomorrow.

A Spectris Company

Particle Measuring Systems is part of Spectris plc,Ā who harnesses the power of precisionĀ measurement to equip customers to make theĀ worldĀ cleaner,Ā healthierĀ andĀ more productive.​

Precision is at the heart of Spectris who providesĀ customers with specialist insight through high-tech instruments and test equipment.Ā 

Spectris is committed to maintaining highĀ standards of corporate governance, both at theĀ Board level and throughout the Group. This isĀ fundamental to the effective and responsibleĀ management of the business.

Our Mission Statement

We lead in contamination monitoring and empower clean manufacturers with innovative technology and exceptional service, driven by our dedicated global team.

A Spectris Company

Particle Measuring Systems is part of Spectris plc,Ā who harnesses the power of precisionĀ measurement to equip customers to make theĀ worldĀ cleaner,Ā healthierĀ andĀ more productive.​

Precision is at the heart of Spectris who providesĀ customers with specialist insight through high-tech instruments and test equipment.Ā 

Spectris is committed to maintaining highĀ standards of corporate governance, both at theĀ Board level and throughout the Group. This isĀ fundamental to the effective and responsibleĀ management of the business.

Our Mission Statement

We lead in contamination monitoring and empower clean manufacturers with innovative technology and exceptional service, driven by our dedicated global team.

Our Values

Be true

We believe in absolute integrity. It’s how we win for stakeholders, the environment and each other.

Own it

We believe in teamwork and keeping our promises. It’s how we build our brands and businesses.

Aim high

We believe in being bold and positive. It’s how we perform at our best and achieve greater success.

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