... 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. Test ... adapter cable with RJ11port;3. When the voltage is low, it can display low voltage;4. Automatically time-delay shutdown function;5 ...