Particle Measuring Systems (PMS) sets the standard for cleanroom contamination monitoring. With more than 60 patents, we create the technology that enables you to make fact-based decisions, improve process yield and comply with changing regulatory requirements.

We understand the challenges our customers face. That’s why we keep up with your changing needs by actively participating in industry, trade and technology groups. Learn how we support training for industry professionals through our Particle College® continuing education program.

With more than 350 employees, over 35 distributors, and local sales and services in more than 70 countries, we’re local everywhere.


How did we get to be the largest particle counter manufacturer in the world? It’s simple. We invented laser-based particle counting.

Since 1972, we have reaffirmed our technology leadership position by continually pursuing advanced detection technologies, and regularly releasing new products that focus on current challenges and future needs of the industries we serve.

Acquired by Spectris in 1996, PMS is one of 13 operating companies focused on providing productivity enhancing instrumentation and controls.


Our culture is just as important as the technology we create. We’re committed to doing things the right way whether we’re interacting with our customers, employees or technology. Our values of restless innovation, empowerment, absolute integrity, customer focus and high performance drives our pursuit of excellence. We’re proud to produce and reward a culture of ethical behavior at all levels and in all circumstances.

Mission Statement

To be the differentiated leader for microcontamination monitoring by improving the performance of clean manufacturers through the application of superior technology, quality and service.


A global technology leader in the environmental monitoring industry, Particle Measuring Systems, a Spectris company, is the inventor of laser particle counting and the largest particle counter manufacturer in the world.

Regardless of industry or monitoring requirements, we help manufacturers reach their goals.

Particle Measuring Systems sets the standard for contamination monitoring in semiconductor, data storage, display, pharmaceutical, nanomaterial, aerospace, and related industrial manufacturing applications. Our investments in research, engineering, and manufacturing of products has resulted in more than 60 patents related to our technology and applications. Grounded by this technical foundation, our market leadership is evidenced by advanced detection technologies and systematic releases of innovative solutions for microcontamination monitoring applications. For years these innovations have enabled process-driven companies to make fact-based decisions, improve process yield, and comply with changing regulatory requirements.

Our technologists actively participate with customers and industry standards committees to understand the evolving needs and challenges faced by our broad customer base. Our renowned Particle College® program includes a two-day series of lectures and hands-on labs covering basic concepts through advanced applications of microcontamination monitoring and control. The sessions are education-focused and are offered semi-annually at the company headquarters in Boulder, Colorado and periodically all over the world.

Global Offices Map

With offices in the US, Belgium, Brazil, China, Denmark, France, Germany, Italy, Korea, Japan, Singapore, Taiwan, UK, and over 35 distributors providing sales and service in more than 70 countries, Particle Measuring Systems is local everywhere.