The Schonstedt GA-72Cd Fluxgate Utility Locator
detects the magnetic field of iron and steel objects and energized power lines. Both provide audio detection signals that peak in frequency when the locator’s tip is held directly over the target. It has easy-to-read digital and bar graph displays of signal strength and polarity. Once you have located a target using the audio signal, the digital readout and polarity indications will help you to visually pinpoint the target and, in some instances, even determine its orientation.