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Met One Instruments, Inc. Air Quality Tools for HVAC Operations

Ensure Efficiency & Optimal Air Quality in HVAC



Met One Instruments, Inc. offers selected weather sensors and handheld airborne particle and dust monitors to ensure HVAC systems work smoothly and efficiently. Our meteorological instruments measuring wind, temperature, relative humidity, and barometric pressure can help a smart system know when and how to operate.



Met One Instruments, Inc.’s handheld devices, which utilize light scatter technology, are an affordable way to monitor suspended particulate in the system to help ensure it is running cleanly and efficiently. In addition, data obtained from our particle counters and monitors can help determine when maintenance is needed—whether that be duct cleaning, a filter change, or other intervention.



Heating, air conditioning, and ventilation units and their ducts can be sources of mold, fungi, and other microbial pollutants, dust particles, secondary smoke, and other organic material. Testing and cleaning HVAC systems and ductwork is achieved through various methods. Typically, the “loosened” particulate matter is drawn throughout the HVAC systems before and after cleaning. Indoor air quality in an HVAC application can be quickly determined before and after the cleaning process with a particle counter. A particle counter can also assess equipment performance and aid in equipment inspection. Our handheld models 804 or GT-324 are instrumental in HVAC applications.





HVAC Products:

  • 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...

  • 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...

  • 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...

  • The Dock, Handheld Particle Counter Docking Station

    The Dock, Met One Instruments, Inc.’s ALL-NEW docking station is a power and communication accessory for select handheld devices. Compatible with the new generation of MOI handheld particle counters, including the Aerocet 532 and DR-528, The Dock will charge the...

  • Swift 6.0 Air Flow Meter

    The Swift 6.0 is a multi-function Air Flow Meter specifically designed for accurate low rate measurements. The device’s easy-to-read display shows flow rate, flow temperature, and ambient pressure. Flow measurements are traceable to our NIST standard and certification is provided...

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