Features: 1. 100% brand new and high quality. 2. Electric Socket Tester - Advanced Socket Tester for quick detection of the correct electrical connection of the socket. Designed using the RCD / GFCI test button - the power outlet is properly wired and the RCD / GFCI trip function. It can test the protection system to ensure electrical safety at home. 3. Easy to use - Detect the neutral line, connect the wires and ground wire correctly, and indicate which line lacks the bright light mode. Bright LED lights and 3 test lights - The lamp holder icon is labeled on the surface of the socket tester. The tester has a built-in light so it can also be used in the dark. Read test results quickly and easily. 4. 7 LED light modes - There are 7 easy-to-read indicators to indicate the status of the socket, easy to judge. 5. Wide range of applications - Widely used in electrical maintenance testing in schools, laboratories, factories and other social areas, office outlet testing, power strip testing and wall socket testing. It can save a lot of time to test socket problems. 6. Portable design - Small size, light weight and easy to use. Specification: Condition: 100% Brand New Function HT106D HT106B HT106E GFCI test >5mA RCD test >30mA >30mA Yes LCD display Yes Backlight Yes operating temperature 0°C-40°C operating Humidity 20%-75%RH Storage temperature -10°C-50°C Storage Humidity 20%~80%RH Altitude ≤2000m Socket connection detection Correct connection Unconnected ground wire Unconnectedneutral wire Unconnectedlive wire Live wire and ground wire reverse Live wire and neutral wire reverse Live wire and ground wire wrong, miss ground wire Weight: Approx. 79-90g / 2.8-3.2oz Size: Approx. 66 * 62 * 60mm / 2.6 * 2.4 * 2.4in Package List: 1 * Socket Tester .