Proflex’s newest model Pro S-25, THE ELF™ is the worlds LIGHTEST and SMALLEST fully capable smoke machine weighing in at only 5.2 lbs. As with all our smoke machines THE ELF™ performs all the above-mentioned tests – Uses shop air and is nitrogen compatible. It has a fixed air pressure rate (1.5 psi) so as not to harm the EVAP system and other vehicle systems.