1-203-402-0477 [email protected]

Volatile Organic Compound VOC Meters, Monitors

For handheld and long-term VOC measurement and logging

GrayWolf’s portable, semi-permanent, and continuous VOC meters, monitors, instruments are highly versatile, for low parts-per-billion ranges up to high PPM toxic VOC exposure ranges. Volatile Organic Compounds (VOCs) emanate from a broad range of sources in industrial air quality and commercial, institutional, and residential indoor air quality (IAQ) applications. GrayWolf offers 4 different plug-and-play Photo Ionization Detector (PID) sensors to choose from; with ranges optimized for your specific application. The DirectSense II-3 probe includes your choice of any of those PIDs, along with relative humidity and temperature sensors. Our DirectSense II-5 probe also includes the sensors for %RH, °C/°F, and accommodates your choice of PID plus up to 2 specific gas sensors (electrochemical or NDIR). The DirectSense II-8 probe offers a PID, %RH, °C/°F, and the choice of NDIR (exceptionally accurate carbon dioxide CO2) and/or up to 5 electrochemical specific gas sensors (8 total). Coupled with the power of our versatile meters and monitors, end-users can efficiently log and annotate readings, while easily accessing on-board information about specific volatiles and potential sources.

GrayWolfLive Software Tripod Single DSII

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

Meter pouches and probe belt clips allow hands-free operation.

  • Choice of low ppb, low ppm, mid-range ppm, wide/high-range ppm and high %RH VOC optimized PID sensors
  • Excellent sensitivity, very low limits of detection (down to <5 ppb); crucial for IAQ/green building applications
  • %RH and °C/°F are also included; add up to 5 specific gas sensors, in addition to the PID, in one probe
  • Choose from 25 different electrochemical gas sensors, such as carbon monoxide (CO), ozone (O3), ammonia (NH3), Cl2, H2S, NO2, NO, SO2, ClO2, HCN and more
  • In addition, a high accuracy, fast response NDIR carbon dioxide (CO2) sensor is available (thus perfect for ARC Skoru, LEED, WELL or other ongoing maintenance applications where this sensor is accepted technology)
  • Ideal for screening for if/when and where air sampling might be advised
  • Rapid response; ideal for “blood hounding” VOC sources
  • Connect to a GrayWolf manufactured instrument (AdvancedSense® or WolfPack®), a GrayWolf supplied WIN 10 Mobile Tablet or to your own Laptop/Notebook PC
  • Log portable spot measurements, or monitor and record data unattended over time in secure trend data-logger housing
  • Store enhanced survey information; data and text, audio, drawings, video notes and more; all auto-associated with relevant location/site files
  • On-board list of potential sources of measured VOC levels and other useful info
  • Almost all Total VOCs (TVOCs) of concern for Indoor Air Quality (IAQ) situations are detected. Click here for more IAQ application options
  • On-board correction values for specific volatiles versus standard calibration compound (isobutylene)
  • Our optional GrayWolfLive cloud platform enables remote access to live and logged VOC data, from one or multiple GrayWolf probes, on your smartphone or on just about any internet connected device. View data as live readings, tables, gauges and/or graphs and more. Click here for more info.
  • Load your own application related documents or procedures (.pdf, Word, HTML, etc.)
  • Software handholds users through user calibration procedure; even includes an on-board instruction video
  • Extremely easy-to-use
  • Desktop data analysis and reporting software is included.
  • Optional advanced report generation (ARG) software significantly reduces any report generation time on VOC testing and is available with templates for LEED, WELL and ARC reporting on TVOC measurements
GrayWolf TVOC, multi-gas monitors, meters, detectors and instruments efficiently log your data and enable enhanced documentation for your surveys by means of cutting-edge sensor technology, advanced software and the power of mobile computing.

Example Screens

AdvancedSense XM Rugged
GrayWolf Meter Screens

GrayWolf AdvSXM TVOC Meter
Toxic Gas Measurements can be viewed and analyzed on different platforms including the AdvancedSense XM, Tablets, GrayWolfLive Cloud and Mobile Phones
Toxic Gas Measurements can be viewed and analyzed on different platforms including the AdvancedSense XM, Tablets, GrayWolfLive Cloud and Mobile Phones
GrayWolf offers various TVOC measurement kits that include a DirectSense II probe with Photo-Ionization Detector (PID) smart sensors and include a rugged, purpose-built AdvancedSense XM meter, or GrayWolf supplied rugged Android device, or GrayWolf supplied rugged Windows tablet, or a set-up to use your own iOS/Android/Windows device.
WolfSense application software, WolfSense PC desktop data transfer & reporting software, universal AC adapter/charger w/extension cable, hard-shell case and additional accessories. Kits can be expanded for IAQ and/or toxic gas sensors, particulate, air velocity, differential pressure, WolfSense Advanced Report Generation software, GrayWolfLive cloud logging/reporting software and more.
Use data collected from your Advancedsense XM to easily Generate Reports

Optional “Advanced Report Generator” software automates efficient production of detailed TVOC survey reports. Click here for an example WSARG report.

Choose Your Platform(s)

AdvancedSense XM

AdvancedSense PRO/BE and DSII

GrayWolf’s all-new, purpose-built AdvancedSense® XM meters are feature rich. Up to 32 simultaneous parameters connecting multi-sensor DirectSense® II probe(s), in addition to other internal and external sensors (and/or particle meters) via cable and/or Bluetooth. Also use this meter’s Wi-Fi to access all parameters via the cloud.

Windows Devices

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 8/10/11 Laptop/PC. Multi-probe connection via cable and/or Bluetooth wireless. Feature rich.

iOS and Android devices

DSII and Smartphone

Bluetooth connection direct to iOS and Android devices (tablets, smartphones, etc.). Use your own or GrayWolf supplied. Audio/photo/video/IR/text notes, advanced data-logging, on-screen graphing, sensor tips and many other features using the free Apple and Google Play store WolfSense Mobile apps.

GrayWolfLive Cloud

GrayWolfLive Cloud

GrayWolfLive® secure cloud platform for remote real-time access, data-logging, and alerts. Connect straight from Wi-Fi enabled DirectSense II probes or via various GrayWolf meters, tablets, iOS or Android devices. View data as text, graphs, gauges, and/or tables. More Info


DirectSense II Probe
TVOC Brochure
AdvancedSenseXM Environmental test Meter
Toxic Gas Brochure
AdvancedSense DirectSense IAQ brochure
GrayWolfLive Cloud Data Logger
WolfSense PC brochure

     Application Notes

Download “Arc™ Testing: Instrumentation for the ”Human Experience“
Download “USGBC LEED® v4 EQc4 – Air Quality Assessment”
Download “Performance Verification of Indoor Air Purification/Filtration Products;”
Utilizing PIDs
Download “Utilizing PIDs (for
VOCs) during IAQ Investigations”
Download “WELL-Building-Application-Note”
Download “Measuring Byproducts of 3D Printing”

For Detailed Information: