- Multifunctional automotive circuit tester: checks electrical systems, continuity, polarity, grounding, and voltage detection. A reliable tool for vehicle owners and technicians to diagnose wiring quickly and accurately. - Built-in flashlight: provides illumination for tests in low-light environments and can serve as an auxiliary light when clips are connected to the battery terminals. - Extended reach: a 5-meter test wire lets you reach from the battery to the dashboard while the LCD displays clear readings for easy viewing. - Easy operation: connect the red clip to the positive terminal and the black clip to the negative terminal to power on, with the measured battery voltage shown in bright blue digits on the LCD. Use scenarios: - Diagnose no-start or dim-light conditions by measuring battery voltage, checking continuity, polarity, and grounding along the circuit. - Verify correct polarity and grounding when installing aftermarket components (eg, radios, lighting kits) to prevent wiring issues. - Inspect wiring in low-light engine bays or underdash areas, using the built-in flashlight to illuminate the work area while readings are shown on the LCD.