Item Type: Socket Tester Material: ABS Main Functions: 3-pin socket line sequence detection, phase voltage (L_N) detection, leakage voltage (N_E) detection, leakage switch (RCD) detection Working Voltage: 90-250V 45-65HZ Phase Voltage Measurement Range: 90-250V, 45-65Hz, Accuracy: (2.0%+2) Leakage Voltage Measurement Range: 0-99V/45-65Hz, Accuracy: (2.0%+2) Working Temperature: 0-40 Working Humidity: 20%-75%RH Storage Temperature: -10-50 Storage Humidity: 20%-80%RH Altitude: 2000 Meters RCD Current: >30mA RCD Working Voltage: 220V20V GFCI Test: >5mA GFCI Working Voltage: 110V20V (ground fault current leakage protector; it is a special protection device for the North American market) How to Use: Plug the tester into a standard 3-hole power socket. When an error in the socket wiring sequence is detected, the red backlight will light up to indicate a wiring error. Then observe the indicator and the function comparison table to determine what kind of socket wiring is wrong, and then unplug the tester. When the wrong wiring is detected, please find a professional electrician to repair the wiring. RedRedRed Correct Missing Ground Missing Neutral Line Missing Live Wire Live and Ground Reverse Connection Live and Neutral Line Reverse Connection Live and Ground Wire Are Reversely Connected, Lack of Ground Note: Phase and ground are wrong and lack of ground: the live wire and the ground wire are reversely connected, and the ground wire is not connected. This tester cannot distinguish between the reverse connection of the neutral wire and the ground wire.