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Receptacle tester. A receptacle tester or outlet tester is a device used to verify that an AC wall outlet is wired properly. The tester itself is small device containing a power plug and several indicator lights.
If the voltage is at least 200 volts for three pairs of slots, the outlet is probably a three-phase outlet. Examine the circuit breaker for the outlet. A circuit breaker with three switches connected together so that all three must be turned on or off at the same time is a three-phase circuit breaker.