The Extech FG100 is a compact, highly sensitive gas leak detector designed for fast identification of combustible gas leaks in residential, commercial, and industrial settings. It detects Liquefied Propane Gas (LPG) from 500 to 6500 ppm and Liquefied Natural Gas (LNG) from 1000 to 6500 ppm. Features include audible and visual alarms, LED leakage indicators, continuous 4-hour operation, and a pocket clip for portability—ideal for HVAC technicians, plumbers, and safety inspectors.