TPI 725L Compact Pocket Friendly Combustible Gas Leak Detector detects various gases such as butane, methane, propane, kerosene, gasoline, and diesel with 40-ppm sensitivity. The TPI 725L features very user-friendly LED lights to help guide the user to the source of the leak. With the TPI 725L’s compact size, it is very easy to pull out and check for leaks in a flash.