The TIF TIF8900 is the perfect tool to be used in a situation where a combustible gas, vapor or residue needs to be found. It is a super-sensitive, cordless, combustible gas detector that detects a broad range of natural gases including propane, methanol, butane, and gasoline. Its uses include: Gas lines and Pipes, Exhaust and Fuel leaks, Propane filling stations, Fuel in marine bilges, Heat Exchanger leaks, Check manholes for safety, Detect arson residue, IAQ tests, and Liquid or gas fired heating systems.