A handheld gas leak detector for methane, natural gas, propane, gasoline and many other combustible vapors. Its 16-inch flexible gooseneck probe reaches tight spaces, while an adjustable sensitivity wheel and combined audible/visual (tricolor LED) alarm flag leaks down to roughly 50 ppm methane. Runs on 3 C batteries for about 8 hours and ships with a soft carrying case; the sensor tip is user-replaceable.