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Monitoring Indoor Air Quality

Breathe Easy Knowing What Is In Your Space

Monitoring indoor air quality is essential for the health, safety, and comfort of people in a space. Met One Instruments offers several portable and bench-top particle counters that provide a convenient and portable way to test indoor air quality, spot check or verify cleanrooms, and test HVAC air filter efficiency. Our particle counters and mass monitors are cost-effective, accurate and reliable. One-touch monitoring makes these devices fast and simple to use. Met One also offers a portable dust monitor designed to measure and record information in a space continuously. Our instruments are well-suited for corporate offices and manufacturing spaces, as well as residential, school and public areas.

Determine which handheld or benchtop air monitoring device is appropriate for your application:

Handheld Products Comparison

Indoor Air Monitoring Products:

  • Benchtop Particle Counter BT-645

    Met One Instruments’ BT‐645 Benchtop Particle Counter has been designed to continuously measure and record particulate information for indoor work place and public space environments. Our BT-645 optical sensor, matched electronics and backlit display, are enclosed in a rugged metal...

  • The ES-642 Remote Dust Monitor

    Remote Dust Monitor ES-642

    Met One Instruments’ ES-642 Remote Dust Monitor is an industrial air-quality sensor designed to provide real time particle concentration measurements in both indoor and outdoor environments. Our ES-642 measures particulate concentration using a highly sensitive forward scatter laser nephelometer, which...

  • DR-528 Handheld Particle Counter

    Meet the newest addition to the Met One Instruments, Inc. lineup of handheld particle counters: the DR-528. This particle counter is optimized in functionality and ease of use with a 2.8″ TFT full-color LCD display, making accurate measurement readings and...

  • Aerocet 532 Handheld Particle Monitor

    Meet the newest addition to the Met One Instruments, Inc. lineup of handheld particle monitors: the Aerocet 532. This particle monitor has been optimized in functionality and ease of use with a 2.8″ TFT full-color LCD display, making accurate measurement...

  • Handheld Particle Counter GT-521S

    The GT-521S is a full-featured, battery-operated, portable particle counter that provides the functionality of a bench unit with the convenience of a handheld. This powerful device supports cumulative or differential counts, standard concentrations, total counts and count alarms. It can...

  • GT-324 Handheld Particle Counter

    Met One Instruments, Inc.’s Model GT-324 particle counter is a full-featured handheld particle counter that provides the functionality of a bench unit in a portable package. A fully integrated RH/Temp sensor immediately provides data to your displayed and logged data....

  • Aerocet 831 Handheld Particle Counter - Met One Instruments

    Aerocet 831 Handheld Aerosol Mass Monitor

    The Aerocet 831 is a completely portable, full–featured, battery operated, handheld mass monitor. This device simultaneously provides five critical mass ranges (PM1, PM2.5, PM4, PM10 & TSP) in one minute from start up. Survey the environment with the easy to...

  • Model 804 Handheld Particle Counter - Met One Instruments

    Handheld Particle Counter Model 804

    Met One Instruments’ 804 handheld particle counter is a 4-channel portable particle counter that counts particles 0.3 microns to 10.0 microns – giving you portability and reliability at very competitive pricing. Though compact, this unit is completely self-contained with its...

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