A leading global provider of portable gas detectors and gas detection as a service. Visit our site for product details, rentals & gas detection services, Gas detectors (or gas monitors) are critical pieces of safety equipment used to protect life and property. Using visual and audible alarms, they warn users of atmospheric hazards including dangerous levels of toxic and explosive gases and low oxygen levels. Single-gas detectors sense the presence of gas indoors in a laboratory or facility. They measure gas levels and alert personnel to the presence of harmful gasses.