Handheld gas detectors detect a variety of combustible gases. Gas detectors are Ideal for locating the source of a leak with certain models able to trace leaks where pipework is not visible or enclosed. The level of gas leak detector will depend on the features required such as alert types, sensor and calibration requirements. Detect gases automatically and effectively with automated gas detector test systems from Grainger. Detect levels of LEL, oxygen, carbon monoxide, hydrogen sulfide and sulfur dioxide. Gas & Carbon Monoxide detectors can be used with any alarm system to monitor for gas leaks or a build up of CO in a home or business. These life safety devices are a must have if you use natural or any combustible gas. Couple these with central station monitoring and you can have someone there to help when an emergency arises.