Features: 1. It is a professional socket tester with mini portable design, making it easy to carry and simple to use. 2. It can detect the wiring of the socket quickly and accurately. It can test socket voltage and show data on the LED screen simultaneously. 3. The high-definition display can help you see the screen value clearly in the dark environment. 4. It can detect the wiring status of the socket quickly and accurately, making it widely used in the school, laboratory, factory and other social fields. 5. There are EU or UK or US plug, you can select corresponding plug according to the region of use. Specifications: Plug standard: EU or UK or US plug Operate voltage: 48 - 250V or 45 - 65Hz Measure voltage:48 - 250V or 45 - 65Hz Accuracy:(2.0 percent and2) Altitude:2000m RCD test:30mA RCD working voltage:220V20V GFCI test:>5mA GFCI working voltage:110V20V Item size: 68x65x60mm or 2.68x2.56 x2.36inches Note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. There are three kinds of plugs, EU or UK or US plug, please be careful before choosing. Package includes: 1 x Socket tester 1 x Manual