RealTime LED voltage display: Instantly view precise voltage levels on the LED digital screen, enabling fast and accurate circuit diagnostics for professionals and hobbyists alike. MultiFunctional testing tool: Detect short circuits, open circuits, and trace wire locations with ease, making this pen a versatile choice for automotive, electrical, and DIY projects. Wide voltage range accuracy: Covers 6V to 75V DC with 0.1V resolution and ±(13digits) accuracy, supporting various system voltages for reliable testing results. Polarity indication: Easily identify positive (red) and negative (green) poles with intuitive LED lights, reducing errors during operation and enhancing safety. Use scenarios Automotive electrical diagnosis: Inspect battery and wiring harness for shorts, verify supply voltage, and locate faulty circuits during vehicle repairs. Home electrical work and DIY projects: Verify wiring and circuits during installation or troubleshooting of outlets, switches, and panels; trace wire routes in harnesses. Electronics hobbyist prototyping: Check power rails and trace lines on breadboards and PCBs while developing projects.