LAN PROBE WIRE TRACKER & TONE GENERATORHighly practical installation trouble shooting tool. Tone signal generator and Cable Tester in one. Includes 2 test leads and a 4 conductor modular cable. Probe can detect the generated tone through cable insulation and in inaccessible areas. Can be used to verify cable continuity and identify cable faults. Determine line polarity and check voltage the in network line. RJ45 and RJ11 Connections. Suitable for use with UTP and Modular Telephone Networks