Effortless Electric Testing: A 13.5 ft cable enables easy diagnostics of 6-24V DC systems, ensuring smooth evaluation across various electrical components. Versatile uses: Test voltage, check motors and lamps, evaluate conductivity, and trace and locate short circuits for automotive diagnostics. Safe design: Built-in short-circuit protection provides dependable testing and immediate detection of poor ground contacts, enabling safe use. Easy to use: To test positive and negative polarity from the battery to the tip, connect the Voltage Tester Pen to the car battery and switch the power on and off to test polarity in either direction. Practical scenarios: - Vehicle maintenance and diagnostics: check battery voltage, confirm ground connections, and verify system operation. - Short circuit tracing: identify and locate faults in wiring harnesses. - Post-installation verification: inspect motors and lamps and confirm conductivity and circuit integrity.