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The Martindale PC105 16A 3-Phase Socket Tester tests phase presence, sequence, PE, neutral presence and wiring faults in 5-pin 415V 16A sockets. These sockets are commonly found in factories and industrial facilities and the check plug is powered by the socket under test so can give a test result as soon as it is plugged in. The combination of LEDs shows fault types and a useful guide to these is provided on the front of the tester for reference.
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