The FlashPhone Digital Acoustic/ballistic detector is designed to pinpoint the exact location of primary cable fault location when combined with a capacitor impulse discharge unit (thumper). During the flashover at the fault both a magnetic and acoustic signal is generated. There is a time delay between these two signals and the FlashPhone displays this signal as a number. The closer you get to the fault will show a decrease in the number that is displayed. The magnetic signal bar graph shows intensity (magnitude) of the magnetic field generated by the thumper into the cable fault. It also can be used to locate the correct cable route when the maximum bar deflection (magnitude) is indicated. The microphone is designed to be used with an earth probe for soft ground conditions and the flat ground contact can be used on concrete or asphalt.