Main Functions This Cable Tester can be used to diagnose common problems in telephone, data, internet, voice, security and communication cables. High Performance It can trace wires and identify cables in all common wiring systems, with high sensitivity and accuracy and efficient operation. With Indication Features audible and visual indication, two different signatures, and LED indicator proximity lighting for easy identification. ABS Shell The cable toner detector shell is made of ABS material, which has good toughness, high strength, wear resistance and long service life. Use Scenarios - In an office or data center, quickly trace and identify cables among many runs in patch panels and cable trays. - During installation or maintenance of telephone, data or security systems, locate and verify correct cable routes and terminations. - For field testing of network or alarm cabling, locate faults, identify cables, and confirm connections with audible and visual signals.