SIMPLE: Simply insert the tester into a three-prong outlet that is already powered. The outlet's wiring status and AC voltage can be easily determined based on the information displayed on the instrument's screen. OUTLET WIRING SEQUENCE TEST: Insert the tester into a standard three-prong power outlet. If a wiring sequence error is detected, the orange backlight will illuminate to indicate a wiring error. Refer to the display to identify the specific type of wiring error. DATA HOLD: After insertion into the socket, the data automatically locks after three seconds. Once locked, press the release button to release the data. LEAKAGE SWITCH DETECTION: Insert the tester into a three-pin socket, ensuring the display indicates correct wiring. Press and hold the RCD button for more than 2 seconds. In this case, a faulty device A functioning residual current device (RCD) should trip, displaying the trip time. The button indicator will flash, indicating the end of the tripping process. If it