Connect it to the vehicle EVAP system and simply press one button: Snap-on's EELD500 Smart Smoke automatically performs a calibration and leak-test, with pass/fail results in less than five minutes. Use the auxiliary vacuum port to test Chrysler/Jeep ESIM and NVLD switches, and to validate FTP sensor readings. All results are clearly readable on the large LED digital display and comes with a wireless remote. Smart Smokecomes with STAR EnviroTech OEM-approved diagnostic smoke technology and UltraTraceUV dye solution.