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Easy to use and view with no complex, multiple screens; everything is displayed on a single large screen. Monitor status indicates if all monitors have completed testing and if the vehicle is ready for emissions testing. Monitor icons indicate which monitors are supported by the vehicle being tested and if the related monitor has its diagnostic tests. Check engine light icon verifies which code, if any, commanded this light to go on. DTC (diagnostic trouble code) sequence identifies the causes of the check engine light coming on. Pending icon warns of potential problems; tools icon show tool's current testing state. Works on all 1996 and newer cars, trucks, and SUVs that are OBDII compliant. ERASE button clears monitors and resets "CHECK ENGINE" light. Model No. 3100. ASE-certified.