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Custom Microprocessor Controlled For Highest Accuracy And Reliability. 3 Leds For Checking Correct Wiring Status. 0 And 180 Degree Phase Angle Switch Permits Quick Tests And Consistent Readings. Digital Read-Out Of Tripping Time. Constant Current Source Circuitry Ensures That A Fluctuating Mains Voltage Does Not Affect The Accuracy Of Readings. Large Custom Digital Display Readout. Visual Indication Of Reversed Phase And Neutral Wiring At Socket. Designed To IP54 Rating. Complies With Iec 61557. Test Of A Large Kind Of RCD's: Standard, Selective, Ac And A (Dc Sensitive Breakers)