Socket-See-400V-Industrial-Socket-Tester-Socket-See-SOK-65-16HD-Industrial-socket-tester-fault-indication-testing-LED-audible-tone-indication-16A-BS-4343-5-pin-3P-N-E-red-plug-400V-AC-power-source-tough-rubber-holster-for-heavy-duty-use-phases-clearly-identified-as-L1-L2-L3-instant-phase-sequence-is-given-by-3-green-LEDs-rotating-clockwise-with-a-continuous-tone-or-3-red-LEDs-rotating-counter-clockwise-with-a-warbling-tone-protective-conductor-earth-present-is-indicated-by-gre