ST620 Cable Fault Locator is a portable field instrument working on TDR and bridge methods, adopting advanced micro-electronics technology. It is designed to locate accurate fault points in such cables as telecommunication leadsheathed cable, plastic cable or user’s lead covered wire, while the faults include break, mix, earthing, defective insulation, or poor connecting. It is and ideal function-stable instrument for the field operator to improve work efficiency, in addition, it can also be used for circuitry project checking electric property testing of the cable.