Features:Professional handheld network cable testing tool.Used to test the integrity of twisted-pair network cable and the configuration of cables.Also used for installation, testing and maintenance of various cables.With this tester, you can test those cables by yourself, such as T568A, T568B, 101Base-T and Token Ring, etc.Check UPT and STP kind twisted-pair cables. Test open circuits, short circuits, miswires, reversals and split pairs.Judge whether the cable is connected or not.Track the cable to find where the short circuit point is.Receive audio signals in the network cable or telephone line.Judge the telephone line state (free, ringing or in use).Transmit audio signals to target network cable and keep track of its direction.With LED lights indication.Supplied with a specially designed storage bag for you to carry and protect the instrument.