Real-time voltage testing from 12V to 300V provides detailed diagnostics for multiple scenarios, including breakpoint localization and clear differentiation between neutral and live wires. Double audio-visual alerts deliver reliable, contactless AC detection with NCV sensor technology, helping technicians stay safe while quickly confirming power presence. Broad electrical panel compatibility supports a wide range of panels and detection tasks, and it integrates smoothly with multifunctional tool setups for versatile use. Enhanced safety features include a variable-frequency buzzer and insulation safety design to protect users during live-circuit testing, with automatic voltage recognition to support both professional and consumer use. Use scenarios - Panel servicing and installation work: locate fault points and identify neutral versus live wires without removing panels or using invasive methods. - On-site appliance and control circuit troubleshooting: perform contactless verification of live circuits to reduce risk during diagnostics. - Field service and workshop testing: quickly verify live conditions on diverse equipment, improving inspection speed and accuracy.