Indoor Air Quality (IAQ) Meters, Monitors
for handheld, semi-permanent and long-term IAQ measurement

For over 20 years, GrayWolf’s highly advanced, professional indoor air quality (IAQ) meters and instruments 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.
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Connect 1 or 2 DirectSense II multi-sensor probes; via cable or via Bluetooth wireless (as shown).

The DirectSense II smart probes accommodate plug-and-play sensors, including the best on the market for IAQ applications.

Up to six (6) low detection limit, fast response gas sensors plus %RH and °C/°F in a single probe.
Choose Your Platform




- 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
- Clearly displays numerous readings simultaneously; auto-scrolls
- 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.

Example Screens



