Three-frequency underground cable, pipeline path detector 88798879 Three-frequency underground cable, pipeline path detector (2.6W, audio induction method) 8879 is an ideal tool for detecting the direction of underground cables and pipelines. It can also be used with a "A"-shaped frame to find grounding fault points. The frequencies of the transmitted signals of 8879 are: 815Hz, 8kHz and 82kHz, which can ensure in any environment...