instecho 6521 Leak Tamer Plus EVAP Smoke Diagnostic Machine Easy effective versatile tool to help technicians diagnose EVAP trouble codes on domestic and import cars and light trucks Uses patented UltraTraceUV technology the only OEM-approved dye available Works with nitrogen or shop air to meet all OEM test requirements Uses existing OTC LeakTamer accessories Electronic safety valve automatically shuts off airflow into the vehicles EVAP system every time the LeakTamer Plus EVAP shuts off