The socket tester has the inspection function that when the test button is pressed, the leakage switch of the control line should be tripped immediately if the line is normal. If the test button is pressed, the leakage switch does not work. There are two reasons: the first is that the neutral wire and the ground wire of the tested socket are connected incorrectly. In this case, the plug indicates that the connection is correct, but the leakage switch will not Work. The second is that the wiring in the tested socket is completely correct, but the leakage switch on the line fails and needs to be repaired or replaced.
Digital Socket Tester GD105B EU plug:
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