Description: Automotive Circuit Tester: Specially designed for 6V to 24V DC automotive electrical systems, covering various transportation vehicles such as cars and trucks, with comprehensive functions and strong adaptability Polarity and continuity testing: The multifunctional driving test pen easily determines polarity, with clear red and green LED indicator lights. Support continuity testing of switches, relays, and other components to simplify troubleshooting Safe overload protect: Built in overload protect device, automatically trips when the current exceeds 8A, protects the tester from damage, and ensures a safe and worry free diagnostic process Dual alarm system: LED indicator lights and buzzer provide clear visual and auditory signals, automatically disconnect when the current exceeds 7A, and promptly alerts potential faults in electrical components Wide applicability: Whether professional mechanics or DIY enthusiasts, they can enjoy its reliable and efficient performance, advanced features ensure accurate diagnosis of electrical problems, and enhance vehicle safety and performance Specification: Color: As Shown. Material: ABS. Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package Includes: Car Electric Circuit Tester*1