The smart socket tester is mainly used for polarity detection of power socket wiring and safety detection of leakage switch. The voltage and frequency of the socket can be detected and checking if the wiring is correct or not, the tested result will display on the LCD screen clearly. Features: Smart Socket Tester: for detecting the wiring situation of the socket to ensure the safety of household electricity. Reliable Quality & High Performance: ensures to get the result accurately and quickly. Digital LCD Display without Indicator Light: the tested result directly display on the LCD screen clearly for easily viewing, don't need to judge by yourself. Voltage & Frequency Test: the voltage and frequency display on the lower part of the LCD screen at the same time. RCD Leakage Switch Detection: plug the tester into a properly wired three-hole power socket, and short press the leakage test button. Other Features: compact size, portable design, one key operate, easy to use, just plug and play. Applications: useful tool for testing the electrical outlets in home, office, school, factory, etc. Test Results: CORRECT MISSING GROUND MISSING NEUTRAL LIVE NEUTRAL REVERSE LIVE GROUND REVERSE LIVE GROUND REVERSE & MISSING GROUND Specifications: Color: Black / White (Optional) Plug Type: EU Plug / US Plug (Optional) Material: ABS Measuring Voltage Range: 90~120V(US plug), 220~250V(EU plug) Whole Machine Working Current: <3mA (not in RCD status) Measuring Voltage Accuracy: ±(2%+5) Working Temperature: 0~40 Working Humidity: 20%~75%RH Storage Temperature: -10~50 Storage Humidity: 20%~80%RH Altitude: <2000 meters RCD Current: >30mA Front Panel Size: 68 * 60mm / 2.68 * 2.36in Thickness: 45mm / 1.77in(US plug), 50mm / 1.97in(EU plug) Item Weight: 77g / 2.72oz Package Weight: 100g / 3.53oz Package Size: 7.5 * 7.5 * 6.5cm / 2.95 * 2.95 * 2.56in Packing List: 1 * Socket Tester 1 * Manual (English)