Feature: 1. Plug and play, it can check the current line safety immediately, and can test the working status of the leakage switch protector with one click. 2. This tester with LED display can help you measure the socket voltage and display it clearly on the LCD screen. 3. The appearance is exquisite, the size is small, and it is convenient to place and carry, and does not take up space. 4. With compact ergonomics and ABS shell design, it can maintain high impact and compressive strength. 5. The detector is used to check and accept the safety hazards of electrical sockets in homes, offices, and factories. Specification: Item Type: Socket Detector Material: ABS + LCD Size: Approx. 6.5 x 6.1 x 6.1cm / 2.6 x 2.4 x 2.4in (Manual measurement, for reference only) Instructions: ①Check whether the socket is leaking ②Check whether the leakage protection switch fails and press the wrong button ③Check whether the wall socket wires are aging, broken, crossed, etc. ④Check whether the power strip can be used normally ⑤Check whether the circuit is lack of wires The Test Result Description of Indicator: The left and middle red lights are on, the line is connected normally. The red light on the left is on, the line lacks a ground wire, and there is a safety hazard! The red light in the middle is on, the line lacks a neutral line and cannot be used normally. All unlit means that the live wire and the neutral wire are connected reversely. The middle and right red lights are on, indicating that the live wire and the ground wire are connected reversely. The red light on the left and the right is on. The line is missing or the line is not connected to the grid. All lights up to indicate that the ground wire and live wire are not connected. Test Whether the Leakage Protection Switch Works Normally: 1. No tripping and no leakage protection 2. Tripping leakage protection is normal. Package List: 1 x Digital Display Socket Detector1 x Manual