Easy and Quick to Use - The socket tester can detect the socket wiring quickly and accurately. In 1 second, you can clearly see the wiring status of the target. Portable Socket Tester and Voltage Detector - Compact size, lightweight and convenient to use. The voltage of the socket can be tested and displayed on the LED screen. Specifications - Product: Socket Tester, Working Voltage: 2.6-3.3V, Test Voltage Range: 0.1V-250V, 1-40KHz, RCD Current: > 30mA, RCD working voltage: 220V±20V, Power supply: 2 x 1.5(AAA) (not included) Multi-purpose socket tester - widely used for electrical maintenance testing, office socket testing, testing power strips and sockets in school, laboratory, factory and other social areas.