Indoor Air Quality (IAQ) Meters, Monitors

for handheld, semi-permanent and long-term IAQ measurement

AdvancedSense PRO IAQ Monitor

For over 20 years, GrayWolf’s highly advanced, professional indoor air quality (IAQ) meters and monitors have made proactive IAQ and green building surveys efficient, and easy to conduct.

  • Reliably measure key specific pollutants (VOCs, CO, O3, NO2, NH3, HCHO, etc.; choose from 25+ gas sensors), as well as Particulate, Ventilation Rates (CO2 and Airflow), Differential Pressure (DP) and more. High performance, fast response instrumentation for consistent use over portable, long-term and continuous IAQ testing applications.
  • Occupant wellness is rapidly gaining awareness as a win-win for occupant health and productivity, and for building owners’ bottom line.
  • COVID-19 has enhanced the need for measurement of ventilation rates, airflow, pollutant pathways and validation of fixed sensors for specific IAQ parameter monitoring in schools, hospitals, public buildings, workplaces, and other indoor facilities of all types.
  • GrayWolf IAQ meters, monitors and instruments optimize the balance between facility energy efficiency and occupant health, comfort and productivity.
  • Identify potential IAQ issues before they become problems and respond immediately to complaints with the highly accurate and most intuitive portable IAQ meters, monitors and testing devices available today.


    DirectSense II Probe in use during IAQ survey

    For portable applications, connect 1 or even 2 DirectSense II multi-sensor probes; via cable and/or via Bluetooth wireless.

    DirectSense II Multi Gas Meter

    The DirectSense II smart probes accommodate true plug & play sensors (up to 8 in a single probe), including the best on the market for IAQ applications.

    Monitor Indoor Environments with DSII IAQ


    Monitor via the cloud with wall-mounted, desktop placed, even handheld WiFi enabled probes. Versatile design for consistency over varied applications.

    Comprehensive IAQ Meters / Monitors

    Prefer an indoor air quality meter for walk-thru surveys and outdoor air comparative spot checking? Want an IAQ data-logger for use as a long-term (hours/days/weeks) trend logger?  Both modes are essential for thorough commercial, industrial, institutional, or residential indoor air quality investigations. And how about continuous IAQ monitoring?

    GrayWolf’s instruments are designed to provide a full solution, from measurement through reporting, for a comprehensive range of IAQ test and measurement needs.

    The high quality IAQ sensors utilized in GrayWolf’s instrumentation also make this equipment the top choice for IAQ/IEQ research projects, for government agencies conducting critical building indoor air quality tests, for validation of low-cost air quality meters/monitors and for many other applications.

    And the versatility of the DirectSense II probes and connective platforms allow you to easily adapt your high-end investment to changing IAQ requirements.


    Choose Your Platform

    AdvancedSense Pro/BE

    AdvancedSense PRO/BE and DSII

    GrayWolf’s rugged, purpose-built AdvancedSense® BE/Pro meters are feature rich. Up to 32 simultaneous parameters connecting our reliable, multi-sensor DirectSense® probe(s), in addition to other internal and external sensors. Connect probes via cable or Bluetooth Classic.

    Tablet PCs

    DirectSense II with Ruggedized Cradle

    GrayWolf supplied MS Windows Tablets are provided with relevant accessories. Or use WolfSense® LAP software to enable your own WIN 7/8/10/11 Laptop/PC. Multi-probe connection via cable and/or Bluetooth wireless. Feature rich as per the AdvancedSense Pro.


    DSII and Smartphone
    Bluetooth connection direct to iOS and Android smartphones and tablets (GrayWolf supplied or use your own). Audio/photo/video/IR/text notes, advanced data-logging, on-screen graphing, sensor tips and many other features using the WolfSense Mobile App.

    GrayWolfLive Cloud

    GrayWolfLive Cloud
    GrayWolfLive® secure cloud platform for remote real-time access, data-logging, and alerts. Connect straight from WiFi enabled DirectSense II probes or via various GrayWolf meters, tablets, or smartphones. View data as text, tables, gauges, and/or graphs. More Info
    • Multi-function
      • Simultaneous measurement of up to eight (8) key IAQ indicators with one probe; VOCs, CO2 (dilution ventilation), CO, O3, NO2, %RH, °C/°F plus an additional toxic gas sensor (from a broad choice of specific gases)
      • Optional particle concentration (PM 1.0, PM 2.5, PM 10, TSP plus 2 other size ranges)
      • With an added probe, concurrently measure up to six additional gases
      • Up to 4 GrayWolf probes, plus a particulate sensor and formaldehyde monitor, may be connected simultaneously to some platforms
      • Optional air velocity probes
      • Optional internal differential pressure sensor (to determine pollutant pathways) and/or barometric pressure sensor
    • Data Logging
      • Manual “snapshot” or automatic “trend” datalogging
      • Store enhanced survey information on-site; data plus text, audio notes, photos, videos, drawings and more…
    • Back-lit color display
      • Clearly displays numerous readings simultaneously; auto-scrolls
        for >8 parameters
      • Automatically updates as probes are plugged in
      • View data in tabular or graphic formats
    • Intelligent user interface
      • Extremely easy-to-use
      • Intuitive icons and drop-down menus
      • Screen prompts user through operation
    • On-board educational tools
      • Feature tips, video help files
      • IAQ info for each sensor: government & industry guidelines, health effects, typical background levels and more
      • IAQ reference documents pre-loaded as PDFs
      • Add your own procedures, docs and Word field forms for on-site use
    • Reporting
      • Download logged data and notes to WolfSense® PC software (included) for analysis and efficient, detailed reporting
      • Optional “Advanced Report Generator: IAQ Edition” software automates comprehensive IAQ report generation
      • Our optional GrayWolfLive™ cloud platform enables remote access to live and logged IAQ data, from one or multiple GrayWolf probes, on your smartphone or just about any internet connected device. View data as live readings, tables, gauges and/or graphs. Initiate reporting from afar and more. Click here for more info.
    • Accessories
      • Probe belt clip keeps sensors away from the influence of operators’ breath
      • Instrument/Mobile PC pouch for true hands-free operation
      • Hard-shell security case for protected trend logging and for transport
      • Optional user calibration kits, application specific software modules and much more…

    Optional GrayWolfLive software allows remote access to instrument data & notes via smartphones, IPads, Droids, PCs, etc.

    PCC-25AP Hard Shell Case securely exposes DSII-8 probe (up to 8 IAQ sensors) plus internal Particle meter (PM 2.5, PM 10 and 4 others sizes for 14 parameters simultaneously) with precision pump for unattended, long-term trending.

    Example Screens

    WolfSense® PC software is supplied as standard for data management and detailed graph generation. Produce detailed reports via copy and paste.
    Optional “Advanced Report Generator: IAQ Edition” software automates efficient production of detailed IAQ (and LEED/WELL green building) reports. Click here for an example WSARG IAQ report.
    GrayWolf IAQ kits include an AdvancedSense meter (or mobile computer), plus multi-sensor indoor air quality probe, WolfSense application software, WolfSense PC desktop data transfer & reporting software, USB download cable, AC adapter/charger, meter & probe pouches and hard-shell security case. Expanded kits include TVOCs, airspeed, particulates, WolfSense Advanced Report Generation software and more. Click here for more info on software


    DirectSense II Probe
    DirectSense II IAQ Brochure
    Toxic Gas Brochure
    Zephyr-III Micromanometer

    Application Notes

    Download “Validating Low Cost IAQ Sensors with High Quality Instrumentation”

    Download “USGBC LEED®
    v4 EQc4 – Air Quality Assessment”

    WELL Building V2

    Download “Utilizing GrayWolf for The WELL Building Standard v2”

    Download “Utilizing PIDs (for
    VOCs) during IAQ Investigations”

    Download “IAQ Testing for Formaldehyde”

    Download “Asthma Trigger Application Note”

    Download “Monitoring Indoor Air Quality in Car Cabins“

    Download “Air Monitoring in IVF Labs“

    Download “Arc™ Testing: Instrumentation for the ”Human Experience“

    For Detailed Information: