The PC104-63 is a 3-phase socket tester for automatically checking supply faults and incorrect wiring of IEC 60309 4-pin, 63A socket outlets. 

Simply connect to the supply, and the test is automatically initiated. The unit will check for phase presence, phase sequence and PE presence. 

Six faults can be identified and are indicated by the bright LEDs on the front panel with individual descriptions of the fault type.