1、Powerful Function: NF‑801B multi purpose line finder, supports telephone line tracking, network line tracking, power cable tracking function, open circuit or short circuit test, etc. 2、Widely Used: It is an irreplaceable practical tool for engineers and technicians in the installation and maintenance of weak current systems such as communication lines and integrated wiring lines. 3、Accurate Line Tracking: Support multi frequency pulse signal transmission, 8Vp‑p signal output level, fast searching, accurate testing, and meet the needs of line detecting. 4、Applicable Objects: Suitable for various departments that require metal lines such as telecommunication bureaus, Internet bar, telecommunication engineering, network engineering, and electric power engineering. 5、Small And Portable: This device is composed of transmitter and receiver, with smooth lines, easy to carry, intimate and humanized design, anti interference, and easy to detect.