this professional plug test can be used in your home, office, kitchen, h? Such and other places you like, it can help you check the connection polarity and home wiring of the socket, which the LED lights to show the results. Go and try it,? A will not let you down. features : small size and easy to carry, you can take it anywhere you want to use, also you can quickly check whether 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 you time. with 6 different LED light models, it shows different test results, easy to read: correct, ground open, neutral open, reverse/reverse, reverse/neutral, reverse/reverse, ground missing. wide Applications: can be used for home, bathroom, kitchen, also can be pursued for electrical maintenance testing and safety inspection. light indicators display test results can intuitively display test results, even in the sun or dark environment can be used normally, giving you better experience of use. features : material: ABS plug: eu, UK, USA (optional) operating voltage: 90 ~ 250V / 45 ~ 65Hz phase voltage: 90 ~ 250V / 45 ~ 65Hz precision: (2.0% + 2) leakage voltage: 0 ~ 99V / 45 ~ 65Hz RCD Test :> 30mA (EU/UK plug) RCD operating voltage: 220V 20V GFCI operating voltage: 110V 20V GFCI Test :> 5mA (American plug) working environment: 0 ~ 40 , 20% ~ 75% rh storage environment: -10 ~ 50 , 20% ~ 80% rh lsize item: 68 * 65 * 60mm / 2.7 * 2.6 * 2.4in lsize item: 74g / 2.6 ounce lsize packing: 75 * 70 * 60mm / 3.0 * 2.8 * 2.4in package weight: 107g / 3.8 ounce packing list : 1 * electric plug tester (optional)