Combustible Gas Detector The TIF is a super-sensitive, cordless, combustible gas detector that detects a broad range of natural gases including propane, methanol, butane, and gasoline. The instrument provides a “geiger counter” ticking signal which increases in frequency as the source of combustible gas or vapor is approached. It is excellent for pinpointing the location of combustible gas leaks as low as 5 PPM. This unit includes a carrying case, owner’s manual, rechargeable batteries and recharger. The unit is ideal for pinpointing known leaks, checking for leaks and verifying safety of potentially hazardous locations.