Realtime voltage display: The voltage display updates continuously in real time, providing uninterrupted monitoring as you test. This makes it easy to interpret results and helps you work more efficiently with the voltage detector pen. Automotive test light with extendable cable: The extendable spring cable increases reach, allowing testing of electrical systems in tight or hardtoreach spaces. This design reduces the need to reposition equipment and simplifies diagnostics in automotive applications. 12volt test light with copper probes: Copper probes easily pierce wire insulation to check circuits, making it suitable for quick circuit verification and wiring checks in car electrical systems and other 12V circuits. Light tester with indicator and digital display: The tester pen includes an indicator light to improve detection and a digital display to show voltage clearly, supporting safe and careful testing. 23 use scenarios Car maintenance and diagnostics: Use during underhood inspections to verify battery connections, ignition circuits, fuses, and wiring harnesses. The realtime voltage readout and piercing probes help identify faults quickly. Electrical system troubleshooting in workshops: Reach relay panels, control modules, and wiring harnesses with the extendable cable, enabling efficient testing across various automotive circuits. Onthego 12V circuit testing: Check 12V power lines in trailers, motorcycles, and other vehicles or mobile setups, where space is limited and reliable voltage readouts are needed.