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Plug Socket Tester is in accordance to IEC, CSA, UL, EN and other international safety standards, and it is designed to inspect the parameters of the circuit and socket are normal. When the test button is clicked, the leakage switch of the control circuit should be tripped immediately if the circuit is normal. And there are two reasons when the switch doesn’t work: the neutral and ground wire connected incorrectly, and the leakage switch in need of repairing or replacing.