1. Advanced socket tester for quick detection of the correct electrical connection of the socket, it can test the protection system to ensure electrical safety at home. 2. With LCD display, it can measure phase voltage (L_N) and leakage voltage (N_E) quickly and accurately. 3. 7 LED lighting modes, there are 7 types of easy-to-read indicators to show the status of the socket, easy to judge. 4. Widely used in electrical maintenance testing in schools, laboratories, factories and other social areas, office socket testing, power strip testing and wall socket testing. This can save a lot of time testing for socket issues. 5. Portable design, small size, light weight and easy to use. Specifications: Condition: Brand New Item Type: Socket Tester Material: ABS Color: As shown in the picture Main Functions: Three-pin wire sequence detection, phase voltage detection (L_N), voltage detection leakage (N_E), leakage switch detection (RCD). Operating voltage: 90-250V Phase voltage measuring range: 90 ~ 250 V Accuracy: (2.0% + 2) Leakage voltage measuring range: 0 ~ 99 V Accuracy: (2. 0% + 2) Operating temperature: 0C~40C Working humidity: 20% ~ 75% RH Storage temperature: -10C~50C Storage humidity: 20% ~ 80% RH Altitude: 2000m RCD Current:>30mA RCD Working Voltage: 220V20V Plug the tester into a standard three-hole power socket. When an error in the socket wiring sequence is detected, the red backlight will illuminate to indicate a wiring error. Then observe the indicator and function comparison table to determine which type of outlet wiring is faulty, then unplug the tester. When bad wiring is detected, please find a professional electrician to repair the wiring. Red Red Red Correct connection Ground wire not connected Neutral wire not connected Live wire not connected Live wire and ground wire reversed Live wire and neutral wire reversed Live wire and ground wire reversed, unconnected ground wire Package list: 1x socket tester 1x instruction manual Note: This tester cannot distinguish between neutral wire and ground wire. Please note that the new type and old type of this product will be sent randomly, and make sure you do not mind before ordering.