From the Manufacturer
Paladin Tools 70025 new work tester kit, RJ45. Quickly and easily test your computer patch cords or installed cable runs to verify good connections or to trouble shoot problems. Cable test begins automatically once the cable is plugged in and the power button is on to identify open, short or crossed connections. The LED clearly lights for each individual pin as the unit goes through the test cycle with a choice of slow or fast display speeds. Verifies proper cable configuration and good connections. Troubleshoots cause of problems with patch cords or network to identify opens, shorts or cross-connections. Tests each individual pin to map the cable. This tester may also be used to detect telephone cross-connection schemes with a RJ11 adapter, not included.
Paladin Tools DataShark Network Cable Tester Kit includes: tester set, patch cords, battery and nylon storage case. Identifies good connections, opens and shorts, and crossed-connections. Features: * LED clearly lights for each pin as the unit goes through the test cycle * Choice of slow or fast display speeds * Connection type: RJ45 UTP modular plug. Will test RJ11 cables with an adapter (purchased separately).