# GrayWolf Sensing Solutions > Advanced Indoor Air Quality (IAQ) and Environmental Instrumentation. Since 1998, GrayWolf has been a worldwide market leader in portable, datalogging, and long-term fixed monitors for IAQ, Green Building, Toxic Gas, and HVAC applications. Headquarters in Shelton, CT, USA and County Limerick, Ireland. GrayWolf Sensing Solutions designs and manufactures professional-grade environmental measurement instruments used in commercial, industrial, institutional, research, and government facilities worldwide. Products span smart sensor probes, handheld and fixed-mount meters, particulate monitors, HVAC measurement tools, and integrated cloud/mobile software. Primary markets include IAQ consulting, industrial hygiene, HVAC commissioning, green building certification (LEED, WELL), aerospace, healthcare, and research. --- ## Company Overview URL: https://graywolfsensing.com/company-info/ Founded in 1998 by four partners with over 100 combined years of environmental instrumentation experience, GrayWolf Sensing Solutions has grown into a worldwide market leader in high-performing portable and semi-permanent IAQ instrumentation. The company acquired the Solomat product line of classical IAQ monitors, digital micromanometers, and air velocity meters in 2004. GrayWolf's fundamental design directive is to make instruments technically superior yet intuitive and easy to use. Over 30 parameters are measurable across GrayWolf's DirectSense probes, AdvancedSense meters, and WolfPack area monitors, including VOCs, CO2, particulates, %RH, differential pressure, air velocity, ozone, ammonia, formaldehyde, nitrogen dioxide, and more. Key milestones: - 1998: Company founded; development of first-generation DirectSense probe and WolfSense software - 2004: Acquisition of Solomat IAQ and HVAC instrument line - 2023: Launch of AdvancedSense XM series of embedded-computer-based meters - 2025: Launch of DirectSense XM smart probes with expanded plug-and-play sensors and on-board logging **US Headquarters:** GrayWolf Sensing Solutions 6 Research Drive, Shelton, CT 06484, USA Phone: 1-203-402-0477 | Toll Free: 1-800-218-7997 | Fax: 1-800-218-0478 Email: SalesTeam@GrayWolfSensing.com **EU Headquarters:** GrayWolf Sensing Solutions, LTD Annacotty Industrial Park, Unit 1C, Annacotty, County Limerick, Ireland Phone: +353 61 358044 | Fax: +353 61 358160 Email: Sales-Europe@GrayWolfSensing.com --- ## Products ### IAQ Meters & Monitors URL: https://graywolfsensing.com/iaq/ GrayWolf's IAQ meters and monitors are designed for professional indoor air quality investigations in commercial, industrial, institutional, and residential settings. They support walk-through surveys, long-term datalogging, and continuous cloud-connected monitoring. Key capabilities: - Simultaneous measurement of up to 8 key IAQ parameters with a single DirectSense XM probe: VOCs, CO2 (dilution ventilation), CO, O3, NO2, %RH, temperature (°C/°F), plus an additional toxic gas sensor selected from 25+ options - Optional particle concentration: PM1.0, PM2.5, PM10, TSP, and additional size ranges - Up to 4 GrayWolf probes plus a particulate sensor and formaldehyde monitor can be connected simultaneously on some platforms - Optional air velocity probes, internal differential pressure sensor (for pollutant pathway mapping), and barometric pressure sensor - Manual snapshot or automatic trend datalogging - Back-lit color display supporting numerous simultaneous readings with auto-scroll for more than 8 parameters - On-board educational tools: IAQ tips, video help files, sensor-specific government/industry guidelines, health effect references, and pre-loaded IAQ reference PDFs - Download logged data and notes to WolfSense PC software for analysis and reporting - Optional Advanced Report Generator (ARG) software for automated IAQ and LEED/WELL report production - Compatible with GrayWolfLive cloud platform for remote real-time and logged data access Applications: occupant wellness assessment, COVID-19 ventilation rate verification, HVAC optimization, IAQ complaint response, school/hospital/office building surveys, research, validation of low-cost air quality sensors. --- ### DirectSense XM Probe URL: https://graywolfsensing.com/build-your-system/ The DirectSense XM is GrayWolf's latest generation modular smart probe. Users configure the probe to their specific application by selecting from a broad library of plug-and-play sensors (up to 8 sensors per probe). The probe features on-board datalogging, Wi-Fi connectivity for direct cloud connection, and Bluetooth LE for wireless link to smartphones, tablets, and AdvancedSense XM meters. The DirectSense XM can operate standalone as a datalogger/monitor or in combination with AdvancedSense XM meters, Windows devices, Android/iOS devices, and GrayWolfLive cloud. --- ### AdvancedSense XM Meter URL: https://graywolfsensing.com/iaq/ The AdvancedSense XM is GrayWolf's purpose-built, rugged handheld meter designed to serve as a powerful hub for environmental measurement. It supports up to 32 simultaneous parameters by connecting to multiple DirectSense XM probes via cable and/or Bluetooth LE, plus internal and external sensors and particle meters. Wi-Fi connectivity enables access to all parameters via GrayWolfLive cloud. Features a color display, intuitive user interface, and rich onboard software. --- ### VOC Meters (TVOC / PID) URL: https://graywolfsensing.com/directsense-tvoc-volatile-organic-compound-meter-monitor/ PID (photoionization detector)-based meters for Total Volatile Organic Compound (TVOC) measurement. Used during IAQ surveys to detect and assess VOC levels. Compatible with the DirectSense XM probe platform and GrayWolf's full software ecosystem. --- ### Toxic Gas Meters & Monitors URL: https://graywolfsensing.com/multi-toxic-gas-meter-monitor/ Multi-toxic gas monitors for handheld and long-term measurement of specific toxic gases in occupational hygiene, industrial, and IAQ applications. Choose from 25+ electrochemical and other gas sensors, including CO, O3, NO2, NH3, H2S, SO2, Cl2, HCN, and more. Supports portable surveys and unattended long-term logging. --- ### Formaldehyde Monitor URL: https://graywolfsensing.com/formaldehyde-monitor/ Dedicated formaldehyde (HCHO) measurement instruments and probes. Formaldehyde is a common IAQ concern in new construction, renovation, and certain industrial environments. GrayWolf's formaldehyde probes are compatible with the DirectSense XM and AdvancedSense XM platform. --- ### Particulate Meters URL: https://graywolfsensing.com/particle-meter/ Particle counters measuring PM1.0, PM2.5, PM10, and Total Suspended Particulates (TSP). Models include the PC-3016A and PC-3500. Can be used standalone or connected to smartphones (via WolfSense Mobile), AdvancedSense XM meters, Windows tablets, and GrayWolfLive cloud. Security case kits (PCC-35P, PCC-36P) allow unattended long-term particulate monitoring with precision pump. --- ### Air Velocity Meters URL: https://graywolfsensing.com/air-velocity-meter/ Hotwire anemometer probes and meters for precise HVAC airflow measurement. Used to assess ventilation rates, identify air distribution problems, and support HVAC commissioning and balancing. Pairs with AdvancedSense HVAC kits for comprehensive HVAC diagnostics. --- ### Pitot-Static Tubes URL: https://graywolfsensing.com/pitot-static-tubes/ Pitot-static tube accessories for duct traversal and high-velocity airflow measurement. Used with GrayWolf differential pressure micromanometers for volumetric airflow calculations. --- ### Differential Pressure – AdvancedSense HVAC Kit URL: https://graywolfsensing.com/advancedsense-hvac-differential-pressure-meters-micromanometer/ Comprehensive HVAC measurement kits combining highly accurate differential pressure, hotwire air velocity, and %RH measurement. Used for ventilation rate calculation, volume airflow measurement, filter resistance testing, building pressurization assessment, and HVAC commissioning. --- ### Differential Pressure – Zephyr XM Micromanometer URL: https://graywolfsensing.com/zephyr-differential-pressure-meters-micromanometer/ The Zephyr XM is a compact, standalone digital micromanometer for differential pressure measurement. Suitable for HVAC filter testing, cleanroom pressurization, and building envelope diagnostics. The Zephyr XM Plus adds %RH and temperature measurement to the standard differential pressure capability. --- ### Green Building IAQ Monitors URL: https://graywolfsensing.com/green-building-indoor-air-quality-iaq-monitors/ Instruments and configurations tailored for green building certification testing under LEED v4 (EQc4 Air Quality Assessment), WELL Building Standard v2, Arc, and similar programs. GrayWolf provides application notes and report generation software specifically designed to streamline LEED and WELL IAQ documentation. --- ### Accessories URL: https://graywolfsensing.com/accessories/ A wide range of accessories including: - Probe belt clips (keeps sensors away from operator's breath during surveys) - Hard-shell security cases for protected long-term logging and transport - Instrument and mobile PC pouches for hands-free operation - Tripods for area monitoring - User calibration kits for TVOC, CO, CO2, and other parameters - Universal AC adapters, extension cables, and more --- ### Rentals URL: https://graywolfsensing.com/rentals/ GrayWolf offers an instrument rental program for customers who need access to professional IAQ and environmental monitoring equipment for short-term projects. --- ## Software ### WolfSense PC Software URL: https://graywolfsensing.com/software/ Windows desktop software (Win 8/10/11) for data transfer from GrayWolf instruments, data analysis, on-screen graphing, and report generation. Included with GrayWolf instrument kits. Also available as WolfSense LAP for use with customer-owned Windows laptops and PCs. Supports multi-probe connection via cable and/or Bluetooth LE. --- ### GrayWolfLive Cloud Service URL: https://graywolfsensing.com/graywolflive-cloud-iaq-voc-monitoring/ Secure cloud platform enabling remote real-time access to data from GrayWolf probes, meters, and monitors. Connect directly from Wi-Fi-enabled DirectSense XM probes, or via GrayWolf meters, tablets, Android, or iOS devices. Features include: live readings, trend graphs, gauges, tabular data views, remote datalogging initiation, and alert notifications. Accessible from any internet-connected device. --- ### Advanced Report Generator (ARG) URL: https://graywolfsensing.com/wolfsense-arg/ Optional software module that automates the production of comprehensive, professional-quality IAQ survey reports and LEED/WELL green building reports. Integrates with WolfSense PC and logged data from GrayWolf instruments. --- ### WolfSense Mobile App URL: https://graywolfsensing.com/wolfsensemobile/ Free iOS and Android app enabling direct Bluetooth LE connection from smartphones and tablets to GrayWolf DirectSense XM smart probes. Features include: audio/photo/video/text survey notes, advanced datalogging, on-screen graphing, sensor tips, and educational IAQ information. GrayWolf also supplies optional rugged Android devices pre-configured with WolfSense Mobile. --- ## Support & Services ### Technical Support URL: https://graywolfsensing.com/support/ GrayWolf provides technical support for all products including software updates and troubleshooting. ### Service / Calibration URL: https://graywolfsensing.com/service/ Calibration, repair, and service requests for GrayWolf instruments. User calibration kits are also available for TVOC, CO, CO2, and other parameters. ### Custom Demo URL: https://graywolfsensing.com/custom-demo/ Request a customized product demonstration tailored to your specific application and needs. ### Videos URL: https://graywolfsensing.com/graywolf-videos/ Product overview, how-to, and application videos. ### Customer Portal URL: https://graywolfsensing.com/customer-selfserve/ Online portal for existing customers: access manuals, software downloads, and account management. ### Product Literature & Brochures URL: https://graywolfsensing.com/product-literature/ Downloadable PDF brochures for all GrayWolf products, including DirectSense XM, AdvancedSense XM, Zephyr XM, PC-3016A, PC-3500, WolfSense PC, GrayWolfLive, and more. ### Application Notes URL: https://graywolfsensing.com/application-notes/ Technical application notes covering topics including: - LEED v4 EQc4 Air Quality Assessment - WELL Building Standard v2 - Validating low-cost IAQ sensors with high-quality instrumentation - Utilizing PIDs (for VOCs) during IAQ investigations - IAQ testing for formaldehyde - Monitoring IAQ in car cabins - Air monitoring in IVF labs - Asthma trigger measurement - GrayWolfLive cloud applications - Arc testing for the human experience --- ## Customer Base GrayWolf instruments are used by customers across a wide range of industries worldwide, including: **Aerospace & Defense:** Airbus, Boeing, Bombardier, Cessna, General Dynamics, General Electric, Hindustan Aeronautics, Lockheed Martin, NASA, Northrop Grumman, Pratt & Whitney, Raytheon, SpaceX, United Technologies Research Center, US FAA **Airports & Airlines:** Air Canada, American Airlines, Australia Pacific Airports, British Airways, Dubai Airport Authority, Egypt Air, LAX, Lufthansa, Qantas, Scandinavian Airlines System **Architecture & Construction:** Architect of the US Capitol, Burns & McDonnell Engineering, Burj Khalifa, Delos Living, Phoenix Constructors, Skidmore Owings & Merrill, US Green Building Council **Research & Education:** Harvard Medical, MIT, Yale, NIST **Government & Regulatory:** US Army, US Air Force, US Coast Guard, US Navy, US EPA, US OSHA, US State Department, US Treasury, FAA, FDA, NIH, Dubai Municipality **Healthcare & Pharma:** GlaxoSmithKline, Maine Health, Pfizer **Technology & Industry:** AT&T, BASF, Boeing, Camfil, Google, Intel, Seagate, Siemens, Verizon, Wells Fargo **International Organizations:** United Nations, Bureau Veritas --- ## Contact - **US Phone:** 1-203-402-0477 | Toll Free: 1-800-218-7997 - **EU Phone:** +353 61 358044 - **US Email:** SalesTeam@GrayWolfSensing.com - **EU Email:** Sales-Europe@GrayWolfSensing.com - **General Inquiry Form:** https://graywolfsensing.com/contact_generalinquiry/ - **Distributor Contact Request:** https://graywolfsensing.com/contact_localdistributor/ - **Request Detailed Info / Quotation:** https://graywolfsensing.com/contact_detailed/ - **Calibration / Service Request:** https://graywolfsensing.com/contact_service/ - **Tech / Software Support Request:** https://graywolfsensing.com/contact_techsupport/