- 6V-12V-24V DC system tester: pen-style circuit tester that quickly verifies power and ground and identifies shorts and breaks in wires for 6V, 12V, and 24V DC systems. - Wide vehicle compatibility: suitable for passenger cars, sedans, SUVs, RVs, and trucks; a professional tool for detecting open circuits, fuses, tuning signal lights, headlights, taillights, and more. - Bright handle indicator: the handle lights up when the circuit is good; brightness varies with the measured voltage to provide at-a-glance status. - Long probe with clip: includes a long probe and clip to reach tight spaces easily and test efficiently. - Use scenarios: - In a passenger car, verify headlight or taillight wiring by checking power and ground and locating faults. - In trucks or RVs, diagnose open circuits and fuse issues in lighting circuits. - In tight spaces behind the dash or in the engine bay, use the long probe with clip to access hard-to-reach wiring without disassembly.