KZYEE KM10 power scan kit is the most revolutionary circuit tester, which performs each type of service, such as, testing for continuity, diagnosing circuit failures, checking the good and bad ground, activating components on and off the vehicle, capturing MIN/MAX voltage, etc. Enables to accurately diagnose the DC Voltage, AC Voltage, Resistance and Diode of the 12v-24v electrical systems by merely pressing the mode button. Having the ability to power up the components, such as cooling fans, starters, relays, windows, washers and so on. Powered by the car battery or cigarette lighter, no additional battery or wires pulling needed. Provides 20ft extension cable for you to reach all around your vehicles, trucks, and trailers (12V-24V). Also, the built-in flashlight is bright enough to light up your work area. Knows how to test for bad ground contacts instantly, tracking and locating shorts fast without losing fuses. What's more, it is circuit breaker protected, which is a safer measure to protect the tool and your components from overload.