Main functions: 　 　
1. Quickly finding the required line pairs among numerous ones. 　
2. Trace cable with continuous and clear tone, AC Current rejection. 　
3. It tests physical connection status of network cable, such as open , short , miswire and split connection
4. Port flash function directly find target cables connected with switch. 　
5. Telephone Line Test: judging TIP or PING line and judging whether the telephone line is idle, ringing or off-hook.