This professional socket test can be used in your home, office, kitchen, hotel and other places you like, it can help you check the connection polarity and household wiring of the socket, which the LED lights up to show the results. Go and try it, it won't let you down. Features: Small in size and easy to carry, you can take it wherever you want to use it, you can also quickly check the plug wire connection is correct or not. Easy to use: you just need to plug it in to check, also with one-key detection design, which can save your time. time. With 6 different LED light patterns, this indicates different test results, easy to read: OK, Open Ground, Open Neutral, Reverse/Reverse, Reverse/Neutral, Reverse/Reverse , missing ground. Wide applications: Can be used for home, bathroom, kitchen, also can be sued for electrical maintenance testing and safety inspection. Light indicators Test results display can intuitively display test results, even in the sun or dark environment can be used normally, giving you a better using experience. Features:< br /> Material: ABS Plug: EU, UK, US (optional) Working voltage: 90~250V / 45~65Hz Phase voltage: 90~250V / 45 ~ 65Hz Accuracy: (2.0% + 2) Leakage voltage: 0 ~ 99V / 45 ~ 65Hz RCD test: &gt; 30mA (EU/UK plug) RCD working voltage: 220V 20V GFCI working voltage: 110V 20V GFCI test: &gt; 5mA (US plug) Working environment: 0~40, 20%~75% RH Storage environment: -10~50, 20%~80% RH Item Size: 68*65*60mm/2.7*2.6*2.4in Item Weight: 74g/2.6oz Package Size: 75*70*60mm/ 3.0 * 2.8 * 2.4in Package Weight: 107g / 3.8 ounces Packing List: 1 * Electrical Socket Tester (Optional)