TPI 720b Combustible Gas Leak Detector with 16" Goose Neck, 10 ppm Sensitivity Detect combustible gasses including natural gas methane, propane (LPG), gasoline, diesel, and kerosene Trace natural gas lines and fittings for leaks Check gas generation for leaks 16" long goose neck with visual alarm indicator in sensor housing 10ppm ppm sensitivity (methane)