Autel AL539 OBD2 Scanner Car Code Reader Professional Electrical Test Tool (Upgraded Version of AL519) Upgraded Product: The Electrical Tester diagnose 12V charging systems, starting systems and condition of discharged battery, which are previous model AL519 cant do. OBD2 Functions: Complete OBD2 functions includes reading diagnostic trouble codes (Pending, permanent, current codes), live data stream, freeze frame data, vehicle information, I/M readiness, O2 sensor test, On-board monitor test, Component test. Facilitate Repair Work: Besides complete OBD2 functions, this car scanner supports DTC Lookup for DTC definitions and printing via PC, which is convenient for getting the required information to help facilitate your repair work. Practical Hot keys: I/M hot key allow you to quick enter I/M readiness interface for quick state emission readiness check and drive cycle verification. Favorable Design&Price: Bright color coded LEDs and built-in speaker provide both visual and audible tone for readiness verification. Cost-effective when compare with similar code reader for gaining the electrical test function. Great Price: This code reader with multimeter function just sold 69.99,it is very worth price.