The Pocket Air Check gas leak detector is a portable, battery operated, solid-state instrument intended for use in applications requiring detection of combustible gas leaks. Handheld and highly sensitive, the Pocket Air Check makes finding gas leaks as easy as using a flashlight and at a fraction of what other portable detectors cost. The Pocket Air Check is a toolbox requirement for the HVAC technician, plumber, homeowner or anyone working with combustible gas installations, especially natural gas or propane. • Detects Natural Gas, Methane, Propane, Hydrogen and Butane gas leaks • Locates leaks in pipes, valves, fittings and tanks Highly sensitive solid state sensor