Socket tester is mainly used for polarity detection of power socket wiring and safety of ground fault circuit interrupter (GFCI) and residual current device (RCD). It can quickly and accurately detect the wiring condition of the socket. Used to examine the safety of socket lines in residences, offices, commercial buildings, and other places. It is the perfect choice device for residence safety inspection and electrician installation and maintenance. (Note to Buyer(s): RCD and GFCI functions do not coexist)
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