Voltage detector pen - Function: checks relays and the on-off state of diodes and circuits; serves as a power tester pen. - Benefits: quickly identifies live circuits and active components; helps solve automotive electrical problems with accurate readings. Circuit tester automotive - Function: tests continuity; supports jumper lead operation with the aid of an auxiliary ground lead; probe tester. - Benefits: confirms wiring continuity and fault paths; versatile testing through the auxiliary ground lead for more complex circuits. Car maintenance test - Function: features positive and negative clips with strong bite force; clips stay in place for reliable testing; automobile circuit tester. - Benefits: secure, reliable connections during testing; reduces interruptions caused by clip slippage; improves user experience during maintenance checks. Relay tester - Function: tests conductivity and voltage polarity; suitable for DC 6-24V systems; fuse tester. - Benefits: validates relay operation and polarity; broad DC compatibility for common automotive systems; includes fuse testing capability. Use scenarios - Diagnose headlight or dashboard lighting issues by verifying power presence with the voltage detector pen and tracing circuits with the circuit tester automotive. - Locate faulty relays, fuses, and wiring paths in a 6-24V DC automotive electrical system using the relay tester and fuse testing capability. - Check wiring continuity and secure connections during sensor or module replacement, leveraging the jumper lead operation and auxiliary ground lead for thorough verification.