Ensure error-free local area connections and speed up network troubleshooting using the D-Link Professional RJ45/RJ11/RJ12 Handheld Networking Cable Tester. Custom-engineered by global network infrastructure titan D-Link Systems, Inc., this essential tool is a vital asset for network engineers, IT professionals, telecom technicians, and DIY custom wire installers. By splitting neatly into a matching master unit and a detachable remote panel, it allows a single installer to seamlessly map horizontal data runs, long structural wall lines, and complex server patches from opposite ends of a property without hauling heavy desktop diagnosis stations around the job site.