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Martindale EZ365 Socket, Earth Loop and RCD Tester, Yellow, 65 x 80 x 59 mm Quick and easy testing of polarity, loop impedance and RCDs LEDs and buzzer indicate 28 fault conditions Non-trip earth loop impedance test Incoming supply polarity swap touch test Features chart on the tester for quick fault identification Martindale EZ365 Socket, Earth Loop and RCD Tester, Yellow, 65 x 80 x 59 mm