... status of STP/UTP 5E /6E cable, telephone line, BNC cable, USB signal line;2. Use crosstalk test to solve the potential ... -1200meters;4. Judge the open circuit point, and the net line crystal head open point ( left, right or middle );5. ... telephone, TV network line project;3. Other metal wire line engineering and maintenance;Package items utp cable telephone line bnc cable usb signal line tester