Saves hours of diagnostic time and is 100% effective. Uses a non-toxic oil-type compound to produce a thick smoke which pinpoints the spot of the leak. Ideal for vacuum, exhaust, evaporative and other enclosed systems. Portable 12V tool performs all tests with vehicle engine off! Machine produces only 1.5 PSI making it easier to see exiting smoke without creating enough pressure to damage the system being tested. Includes cap plugs and exhaust adapter cone. U.S.A.