Socket-See-230V-Industrial-Socket-Tester-Socket-See-SOK-40-16HD-Industrial-socket-tester-fault-indication-testing-LED-audible-tone-indication-16A-BS-4343-3-pin-2P-E-blue-plug-230V-AC-power-source-tough-rubber-holster-for-heavy-duty-use-straight-forward-&-easy-to-underst&-correct-incorrect-conditions-continuous-audible-tone-indicates-correct-sequence-strong-warbling-tone-indicates-faulty-condition-indications-include-L-E-reverse-L-N-reverse-faulty-N-E-or-L-missing-L-manufa