This product is used to check whether the wires of power sockets are connected according to the requirements, and whether the power protection system of the household is normal. It can promptly remind the user to make adjustments to the sockets of faults and safe hazards, guarantee the safety of household electricity. Features: Socket tester is mainly used for power socket wiring detection and RCD test. It can detect the wiring status of the socket quickly and accurately. It has a large and easy read fault chart. Includes 7 different patterns for you to read: Correct, Open Ground, Open Neutral, Open Live, Live/GRD Reverse, Live/NEU Reverse, Live/GRD Reverse Miing GRD. Provides a clear indication that you can quickly understand and use it. As a general measurement tool and widely used in the school, laboratory, factory and other social field. Lightweight and handy size, easy to carry and storage. With three indicators and LCD screen, it is easy for a newer to use it. Impact resistant ABS housing makes the product more practical and prevents it from drop damage. With one button controlling, the meter can quickly test socket if connects positive and negative pole as request and whether household power protection systems works well or not to ensure the household electrical safety. Specifications: Brand name: KKmoon Material: ABS Color: black Voltage: 48V-250V 45-65Hz RCD test: 30mA (EU/UK plug) RCD working voltage: 220V20V GFCI test: 5mA (US plug) GFCI working voltage: 110V20V Voltage measurement: 48V250V / 4565Hz Accuracy: (2.0%+2) Working environment: 0 40, 20% 75%RH Storage environment: -10 50, 20% 80%RH Item size: 65 * 62 * 55mm / 2.6 * 2.4 * 2.2in Item weight: 60g / 2.1ounce Package size: 13.3*9.3*7.7cm/5.2*3.7*3.0in Package weight: 82g / 2.9ounce Note: To ensure your safety, don't make the insert out of shape to affect the test result. Package list: 1 * Socket Tester 1 * User Manual