【Professional Tester】This network cable tester is designed to test cables to find out the line through the fault checking points, wiring network engineering monitoring, line maintenance, short circuits, open circuits, cross pairs and other cabling faults, easy to find the faults to ensure smooth operation of the network 【Split Design】This cable tester can be disassembled for long-distance line detection, divided into master unit and remote unit. Even if the two ends of the cable are in different places, it can be tested. 【Wide range of uses】Applicable to RJ45 network cable + BNC Coaxial (Coax) Cable Tester. Applicable telecommunications network line engineering and routine maintenance work, computer network line engineering, other metal conductor line engineering and maintenance work, to meet the different needs of use 【Portable and lightweight】This network tester can be grasped by hand only, anti-vibration and anti-drop, more suitable for the construction site environment. Can be easily carried at the same time testing network cable in the construction of any major problems! 【Note】G light is shielded light, insert shielded crystal head of the cable will be bright, ordinary cable is not bright.B light is BNC light, insert BNC interface will be bright.