Helium Leak Testing Inc.
- Leak detection, test fixtures, calibration, vacuum pump services, and supplies.
- http://www.heliumleaktesting.com/

Superior Signal Company Inc.
- Manufactures range of smoke generating devices and ultrasonic test instruments. Main applications are in leak detection and determination of friction in worn bearings and gearboxes. Site includes detailed product information.
- http://www.superiorsignal.com/

Prestech Ltd.
- Manufacturers of automated test machines, specialising in leak test and add on computer facilities.
- http://www.prestech.farmore.net/

ATEQ Corporation
- Manufactures and supplies leak testing equipment for wide range of industrial, commercial, building construction, and medical applications. Units can include measurement of flow, volume, pressure, and electrical factors.
- http://www.ateq.com/

Ionics Agar Environmental Ltd.
- Specializes in equipment for detecting oil leaks in various collections of water. Site explains and includes animated demonstration of underlying technical principle, as well as discussing the wide range of possible applications.
- http://www.leakwise.com/

Airometrix Mfg. Inc.
- Manufactures flow meters for testing and monitoring leaks in air compressor equipment and systems. Site discusses likelihood of air leaks and benefits of early detection and elimination.
- http://www.airometrix.com/

Uson Inc.
- Specialists in leak detection, leak testers, leak detection systems, package integrity testing and flow measurement.
- http://www.uson.com/

C&I Solutions Limited
- A UK manufacturer of flow and leak measurement instrumentation for production line quality control and data recording and reporting systems for process and environmental monitoring.
- http://www.candisolutions.co.uk