Digital Network LAN Coaxial Wire Length Cable Tester with 8 Remote Identifiers, Cat 5E/ 6E RJ45 Port Open Short Circuit Connection Wiring Error Type of Tester Cable: STP / UTP twin twisted cable and Coaxial cable Tester Port Tester RJ45 master port (M), atester LOOPBACK RJ45 port (L), far-end recognizer RJ45 port (R) can be used to measure and check the continuity of coaxial cable.) Locating Cable: far-end passive test jack (8 are included in set) Length Calibration: User can set calibration factor by himself by a given length cable. The length of calibrating cable is more than 10M Length Measurement of Twin Twisted Cable Scope: 135m (3~1000ft)