Features: Cable Tracing Function: The cable tracing function can quickly and efficiently find the target cable in large number of cables. This function can be used in telephone systems, computers networks, BNC cables and other metal network cables. Cable Length Test: This function can apply to different metal cables with at least 2 cores including network cables, telephone lines and BNC cables. POE Test: POE testing can check cable mapping polarity and voltage of POE network switches. Multifunctional Cable Tester: This cable tester has the function of analogue tracing, cable mapping, PoE voltage measuring, digital tracing sensitivity adjustable, etc. LCD Display with Flashlight: The sender of this line finder adopts a large LCD display screen to give you a better experience and the flashlight allows you to turn it on when the light is low. Multimeter Function: This function includes direct current and AC voltage and current measurement, resistance, continuity, diode, temperature measurement(Only ET618). ET616/ET618 Optional: There are two different types for you to choose. The network cable length measuring ranges of ET616 is 400M, and the ranges of ET618 is 500M. Only ET618 has the multimeter functions.