Key Features: Portable Electric Socket Tester: Quickly determine if your socket's wire connection is correct. This compact and lightweight device features a voltage backlight LCD display for voltage testing, making it user-friendly and convenient for on-the-go use. Plug & Play: Equipped with an RCD/GFCI test button, this tester allows you to easily check the working state of the leakage protector, providing peace of mind against electrical shock risks. Bright LED Display: The device features red LED indicators that illuminate clearly, even in bright sunlight or darkness, ensuring fast readability. 6 LED Light Patterns: Easily identify socket states with six distinct indicators: Correct, Open Ground, Open Neutral, Live/Neutral Reverse, Live/Ground Reverse, and Missing Ground. Wide Application: Ideal for electric maintenance, office socket testing, power strip testing, and wall socket testing in various environments like schools, labs, factories, and more. It streamlines home improvement inspections and safety checks, saving you time. Specifications: Color: Black Model Options: US/EU/UK Material: Flame Retardant ABS Operating Voltage: 90~250V/45~65Hz Phase Voltage: 90~250V/45~65Hz Leakage Voltage: 0~99V/45~65Hz Accuracy: ± (2.0%+2) RCD Test: >30mA (EU/UK Plug) RCD Working Voltage: 220V±20V GFCI Test: >5mA (US Plug) GFCI Working Voltage: 110V±20V 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 Includes: 1 x Electric Socket Tester