GT85 socket tester ground zero line live line phase polarity leakage detector multi-function electrical tester ✅ GT85 Power Outlet Tester Used to detect the polarity of the plug into the power outlet and check the operation of the residual current device (RCD). The socket wiring condition can be quickly and accurately evaluated. It can be used to evaluate the safety of power lines in homes, offices, public buildings and other places. It is useful for repairing and inspecting wires. ✅ Tester technical parameters: Working temperature: 0°C~40°C Working humidity: 20%~75% RH Storage temperature: -10℃~50℃ Storage humidity: 20%~80%RH Maximum operating altitude of the device: 2000 meters above sea level Leakage circuit breaker current: 30 mA Residual current circuit breaker operating voltage: 220V±20V CE certification Safety level CAT II 300V ✅ RCD button for testing residual current circuit breakers ⭐ Plug the tester into a working power outlet. Press and hold the RCD button for 3 seconds. The residual current circuit breaker should trip. Otherwise, the switch is damaged. A qualified electrician should be called to repair the fault. ✅ Test result comparison table, when viewed from the top, the icons on the device indicate: 1. Correct connection 2. No ground 3. No neutral 4. No phase 5. Phase and ground are reversed 6. Phase and neutral are reversed 7. Phase and ground are reversed and no ground* * The tester cannot distinguish between reversed neutral and ground. ✅ Package Contents: Network Tester*1 Original Packaging*1 User Manual*1