Feature: 1. [Multi Functional] This socket tester can detect common wiring faults in GFCI outlets, including open ground, open neutral, hot ground reverse, hot neutral reverse, open ground faults. 2. [LCD Display] The outlet tester provides test results on a large, super clear LCD screen, ensuring clear visibility even in dark environments, making it easy to read and understand. 3. [Accurate Voltage Detection] Our receptacle could quickly and accurately detect socket wiring, check polarity of power outlets and the safety of leakage switches. 4. [RCD Trip Testing] If there is a ground fault detector in the circuit, you can press the leakage test button RCD to trip it for testing. 5. [Easy to Use] Simply plug and play with one button testing. Ergonomic slim body for comfortable one handed operation, ensuring convenient and efficient measurements. Specification: Item Type: Socket Tester Material: Flame Retardant ABS Battery: 2 x AAA Dry Batteries (Not Included) LCD Display: Yes Trip Time Test: 10-1000ms± (2.0%+4) Data Hold: Yes Auto Power Off: Yes. Package List: 1 x Socket Tester 1 x User Manual