Multifunctional tester for electrical systems in cars, boats, and motorcycles. It tests circuits, fuses, and wiring. Easy to use. Quick setup and effortless operation, suitable for both seasoned mechanics and beginners diagnosing electrical issues. Durable construction. Made from strong ABS and metal materials that resist wear and deformation for reliable performance. Precise diagnostic capability. The steel probe pierces insulation to check circuits accurately. A glowing bulb indicates a good connection; if the circuit is faulty, the bulb does not glow. Key benefits - consolidates testing tasks for circuits, fuses, and wiring with a single tool - compatible with cars, boats, and motorcycles - durable ABS and metal construction for long life - clear visual indication with a glow to confirm good connections or signal faults Use scenarios - In a car, diagnose a suspected blown fuse or verify power delivery to a dashboard accessory - On a boat, inspect wiring for a malfunctioning navigation light circuit - On a motorcycle, check continuity of a wiring harness after repair or damage