- AirScan Environmental Technologies
 - Develops passive gas monitors. - Airwave Environmental Tech
- Company manufacturing fixed gas detectors, analyzers, calibrators and airborne pipeline monitoring equipment.
- ALToptronic AB
- Gas analysers for process control and environmental monitoring.
- AMC Technologies, Inc.
- Offering products for gas detection and montoring, process/ambient analyzing, oxygen analyzing, sterilization generators, and more.
- American Gas & Chemical Co. Ltd.
- Manufacturer of leak detection products, ultrasonic testers, gas monitors, indicators and instrumentation.
 Assured Gas and Electrical Testing
- Provides gas and electrical safety checks including landlord certificates, combined gas, electrical, and PAT testing. Also offers servicing, repairs, and small appliance installation.- Avir Sensors
- Offers TOVA (Totally Optical Vapor Analyzers), a patented platform technology developing simple, low cost, sensitive remote chemical sensors.
- Bacharach, Inc.
- Manufacturer of gas detection and combustion analytical test equipment and calibration equipment, testers and tools for the diesel service industry.
- BEP Marine
- Manufacturing a variety of gas detection products for recreational land vehicles and boats.
- Biosystems, Inc.
- Gas detection, air purification, and "PosiChek" SCBA testers.
- Bomark Instruments, Inc.
- Distributors of gas detection, air, noise and heat monitoring equipment.
- BW Technologies Ltd.
- Designs, manufactures and markets a full line of gas monitoring equipment.
- CanarySense.com
- Authorised distributor of BW Technologies portable handheld gas detectors, monitors, and analyzers. Includes both single and multi-gas units.
- Carbon Monoxide Breath Analyzer
- The COB is a non-invasive device for the diagnosis of carbon monoxide levels in the blood from smoke inhalation, faulty furnaces, and all types of CO poisoning.
- CEA Instruments
- A supplier of hazardous gas detection instrumentation since 1972.
- City Technology
- Manufactures electrochemical and catalytic bead gas sensors for a variety of gases and applications.
- Control Instruments Corporation
- Manufacturer of gas and vapor monitoring equipment.
- Cool Air Incorporated
- Designers and installers of ammonia leak detectors for the refrigeration industry.
- Crowcon Detection Instruments Ltd
- Equipment to detect toxic, flammable and oxygen gas hazards, for mining, water, petrochemical, construction, tunnelling, landfill & other applications.
- Daeshin Electronics Co.
- Manufacturer of gas detectors, toxic gas alarms, fuse clocks with timers, and automatic shut-off devices.
- Delphian Corporation
- Manufacturer of gas monitors, detectors, and instrumentation for toxic and combustible gases from plants, alternative fuel vehicles, refineries, garages, etc.
- Detection Instruments
- Manufactures gas detection systems for oil, gas, and petrochemicals industries.
- Don Smith & Associates, Inc.
- Offers gas detection products for carbon monoxide and propane including alarms.
- EIT
- Manufacturers of gas detection, flow and level measurement and liquid analytical instrumentation.
- Environmental Monitoring Systems
- Making single unit, early warning detectors for smoke, fire, and gas.
- Euro-Gas Management Services Ltd.
- European distributor for the Komyo-Kitagawa gas detector tube system. Also offers a range of oxygen, toxic, and flammable gas monitors as well as calibration products.
- Gas Detection Equipment
- Offers a range of toxic gas and heat detectors plus fire and smoke monitoring systems.
- Gas Measurement Instruments Ltd.
- Designs and manufactures a wide range of gas detection equipment.
- General Monitors
- Manufacturer of combustible and toxic gas and flame detection systems for the industrial and municipal markets.
- Gesellschaft fuer Geraetebau mbH
- Provides gas detectors for almost every application.
- GfG Instrumentation
- Develops and manufactures systems for the measurement of explosive and toxic gases, oxygen, and water.
- Industrial Scientific Corporation
- Designs, manufactures, and markets portable instruments and fixed systems for detecting, measuring, and monitoring a wide variety of gases, including toxic and combustible gases, as well as oxygen.
- International Sensor Technology
- Stationary and fixed instruments offered, technologies include solid state, IR, PID, catalytic bead, and electrochemical.
- Interscan Corporation
- Provides gas detection applications information.
- JJS Technical Services
- Provides gas monitors and gas detection equipment, industrial equipment and supplies, safety supplies, industrial instrumentation, and information on gas detection.
- King Can Industry Corporation
- Manufacturer of industrial CO2 air sensors, subassembly units for microscopes, camera and medical parts, PP juice bottles, caps, spoons, and OEM of injection moulded and high-precision shaft parts.
- Methane Gas Detectors
- Offers methane leak monitoring instruments.
- Mil-Ram Technology, Inc.
- Offering sensors and controllers for monitoring and detecting toxic and combustible gases.
- Monox Limited
- Producing long life, low cost carbon monoxide sensors.
- Neodym Systems Inc.
- Neodym designs, manufactures and offers: dual mode (fixed/portable) gas detectors with USB connectivity; AC/DC (home/mobile) combustible detectors; gas leak detector kits for hobbyists.
- Net Safety Monitoring Inc.
- Develops and manufactures industrial safety monitoring equipments for a wide range of industrial applications.
- Pem-Tech, Inc.
- Manufactures gas detection equipment used in gas plants, oil refineries, offshore production platforms and other petrochemical industries.
- Portable Gas Monitors
- Distributes portable, personal, ultra low-level single and multigas monitors and detectors that are used for employee safety in industrial process environments.
- PPM Technology
- Manufacturers of gas detectors for formaldehyde, glutaraldehyde, and other toxic gases.
- Priority One
- Manufacturer of simple carbon monoxide and combustible gas monitoring equipment.
- RAE Systems
- Manufacturer of wireless monitors and multi-gas, photo-ionization, and confined space gas detectors.
- RKI Instruments, Inc.
- Manufactures, services and distributes gas detection products ranging from personal single gas units to complex multi-point continuous monitoring systems.
- Saldo
- Offering rostrums, magnetic field detectors, smog meters, and more. In Polish, English, German, and Russian.
- Scott/Bacharach Gas Detection Products
- Manufacturer offering a line of fixed and portable toxic and combustible gas detection instruments.
- Senco Sensors, Inc.
- Manufacturer and marketer of residential carbon monoxide detectors and other hazardous gas detectors.
- Sentech Korea
- Manufactures carbon monoxide and combustible gas detectors, alcohol breath analyzers, and other gas sensors.
- SF Detection Limited
- Makes portable gas detection systems.
- Sierra Monitor Corporation
- Manufacturer and marketer of hazardous gas and flame detection systems for combustible gas, oxygen deficiency, and toxic gases.
- Sixth Sense
- Manufacturer of pellistors, catalytic, infrared, and toxic gas sensors and detectors for use in industrial, commercial, and residential environments.
- SmokeSign.com
- Sells smoke alarms and carbon monoxide detectors.
- Telaire
- Offers a variety of carbon dioxide monitors and controls as well as infrared gas sensors.
- Theromo GasTech
- Manufactures, services, and markets personal portable instruments and fixed system gas detection instruments for monitoring toxic gases, combustible gases, and oxygen content.
- Torrent Laboratory
- California state certified analytical laboratory providing sampling, testing, and reporting for air, water, and soil analysis.
- TOTAL Gas Detection Ltd.
- Providing the oil and gas industry a portable infrared gas detection system to identify hydrocarbon gas.
- TQ Environmental plc
- Design, manufacture and installation of gas detection and emission monitoring systems, specialising in maritime applications.
- United Safety
- United Safety Field Services provides H2S protection equipment to the Canadian oil field and industrial services industry.
- W.E. Kuriger Associates
- Sells carbon monoxide, radon and smoke detectors as well as oil and liquid absorbents. Performs asbestos and dust analysis and provides indoor air consulting.
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