- Multifunctional automotive circuit tester checks electrical systems, continuity, polarity, grounding, and voltage detection. Essential for vehicle owners and technicians. - Built-in flashlight provides illumination for testing in low light and can serve as an auxiliary light when clips are connected to the battery terminals. - Extended reach with a 5-meter wire enables testing from the battery to the dashboard, with clear readings shown on the LCD screen. - Easy operation: attach the red clip to the positive terminal and the black clip to the negative terminal to activate the light and display battery voltage in bright blue digits. - Use scenario: diagnose battery and charging system while seated in the cabin; read voltage on the LCD and use the flashlight for engine bay visibility. - Use scenario: test wiring continuity and polarity during installation or repair of lights, sensors, or fuses. - Use scenario: verify grounding and circuit integrity during aftermarket accessory installations (stereo, lighting, etc.).