... . It is a very convenient, intelligent and reliable instrument for precisely locating cable faults, like open circuit, short circuit, ... Featuresl SW_TC880 combines the conventional TDR method and Bridge Method for fault detecting, faults like open circuit, short circuit, ... Balance, Differential, BridgePOWER: Two Li-Ion cells, 5 hours for continuous use, 5 minutes auto power off after last key operation ...