Clear LCD Display：Plug-and-play with no need to remove wall sockets. The high-contrast LCD shows real-time L-N and N-E voltage. Overload (0L) and undervoltage (L0) warnings are easy to read. LED indicators show the status of Earth, Neutral, and Live wires—solid means normal, flashing indicates a fault. 6 Wiring Faults Detection：Identifies six wiring conditions: correct, missing neutral, missing earth, live/neutral reverse, live/earth swap, and live/earth reverse with missing earth. English messages on the screen and LED signals help users quickly judge wiring safety and accuracy. Battery Powered：Runs on 2 AAA batteries (not included), allowing operation even when the socket has no power. Accurately detects neutral and earth status under disconnected or faulty conditions—safe and reliable for on-site inspections. RCD Test Function：Simulates a leakage fault to check RCD performance. Ideal for RCD-protected sockets in kitchens, bathrooms, or outdoors. Use with caution on standard sockets to avoid unwanted tripping. Essential for professional safety checks. UK Socket Compatible：Fits UK standard sockets (BS 1363). Ideal for home, office, lab, and factory testing. Useful for DIY, electrician work, safety inspections, and renovations. Compact, easy to use, and designed for daily electrical safety. Good for DIYers, engineers, safety inspectors.