1、MAIN FUNCTIONS: This cable tester can be used to diagnose common problems in telephone, data, internet, voice, security and communication cables. 2、HIGH PERFORMANCE: Can trace wire and identify cables in all common wiring systems, which has high sensitivity and accuracy, efficient and durable. 3、WITH INDICATION: Features audible and visual signal indication, 2 different tone signatures and LED tone indicator proximity lighting for easy identification. 4、ABS SHELL: The cable toner detector shell is made of ABS material, which has good toughness, high strength, wear resistance and long service life. 5、WIDE APPLICATION: Widely used for cables and wires repair, measurement areas include line tracing, short circuit testing, clear, busy, ringtone recognition, etc.