The Pro900 Digital Underground Cable Locator is a digital underground locator for maintenance contractors and personnel. Incorporating three different locating frequencies, the Pro900 tracks metallic cabling, including CATV, electrical, telephone, sprinkler, and lighting. The Pro900 transmits solid or intermittent tracking signal that is easy to follow. The digital signal reception allows for crystal clear and incredibly sensitive tone reception in most situations with either null or peak reception. The Pro900 incorporates a 50/60Hz passive locating mode, which identifies electrical sources (power cables) and tracks them without using a transmitter of any kind. Contractors can identify the path of 50/60 Hz underground cables without disconnecting them or connecting to them.