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 TesterMaterial: Flame Retardant ABSBattery: 2 x AAA Dry Batteries (Not Included)LCD Display: YesTrip Time Test: 10-1000ms (2.0 percent and4)Data Hold: YesAuto Power Off: Yes.Package List:1 x Socket Tester1 x User Manual