EELD601 MotorVac EVAP Approved Smoke Machine Standard Machine (No Flow Control). Patented UltraTraceUV™ technology deposits a fluorescent dye at the exact location of the leaks. 500 tests per refill. User refillable. A must tool for OBD-II EVAP testing and general purpose leak testing. Nitrogen-based for safe EVAP testing and uses shop-air for general purpose leak testing. Microprocessor technology.