The Wire Mapper Pro Model CA7028 is a hand-held structured cable mapping and troubleshooting tester designed for use on UTP, STP, FTP, and SSTP cabling equipped with RJ-45 connectors and wired to either TIA568A/B ISO11801 and EN 50137, USOC or ISDN specifications. It detects open circuit pairs, shorts, crossed wires, crossed pairs, reversed pairs, split pairs and shield faults.