The DCI-50 is a direct current pulsating service tester and phase identifier. Each tester has a single on/off toggle switch and five LED indicator lights for ease of use. The pulsating tool injects a DC current of 50 Amps into the circuit being tested. The AVRCT, Audio Visual Receiver Current Transformer, picks up the signal from the DC Pulser and indicates signal strength and direction as well as positive cable identification. Patented methodology results in the most accurate and versatile de-energized primary cable tester and phase identifier available in the electric utility industry.