The AutoLINK AL539 is an engine code reader and electrical testing tool. It can read and erase engine codes, display live and freeze frame data, supports all 10 OBDII test modes, and has one-click I/M readiness/emissions testing. An OBDII cable, voltage test probes and an AVO meter are included for testing the starting, circuit, voltage, continuity, current, and charging systems. It is updatable via PC, and a 1-year tool warranty and free lifetime software updates are available with purchase.