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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 monitoring equipment have made proactive IAQ and green building surveys efficient and easy to conduct.

  • Measure key specific pollutants (e.g. VOCs, CO, O3, NO2, NH3, HCHO: choose from 20+ gases), as well as Particulate, Ventilation Rates (CO2 and Airflow), Differential Pressure (DP) and more. High performance, fast response instrumentation optimized for portable and long-term IAQ testing.
  • Occupant wellness is rapidly gaining awareness as a win-win for occupant health and productivity, and for building owners’ bottom line.
  • 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.
  • COVID-19 has greatly enhanced the need for highly reliable 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.

Comprehensive IAQ Meters / Monitors

Prefer an indoor air quality meter for walk-thru surveys? Want an IAQ monitor for use as a long-term (hours/days/weeks) trend data logger? Both modes are necessary for thorough indoor air quality investigations; commercial, industrial, institutional or residential. 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 all-new DirectSense II probes incorporate plug-and-play sensors, up to 8 in one probe, allowing you to easily adapt to changing IAQ requirements.

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.

Choose Your Platform

GrayWolf’s versatile, powerful, rugged AdvancedSense® Pro is cutting-edge, yet easy-to-use. Up to 32 parameters with extensive features including WiFi, Bluetooth, camera, microphone, speaker, on-board video help and much more
GrayWolf’s rugged AdvancedSense® BE (basic edition) has reduced parameters and features vs. the AdvancedSense Pro, but still supports multiple sensors, data-logging, text & audio notes and many more advanced, efficient features.
GrayWolf supplied 10″ tablets are economical, yet feature-rich and are supplied with application specific accessories. Or use WolfSense® LAP software operating with your own Laptop (or any Windows 7/8/10) computer.
GrayWolfLive Cloud PlatformGrayWolfLive® cloud platform for remote real-time access, data-logging and alerts via a Wi-Fi enabled DSII probe, AdvancedSense PRO meter or WolfSense LAP enabled tablet).
  • 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


Zephyr III Micromanometer Differential Pressure Meter

Application Notes

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

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

Download “The WELL Building Standard v1, for Air Quality Screening”

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: