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The Rosewill RTK-007 cable tester offers a quick and easy way to test Ethernet cords to uncover problematic opens, shorts and miss-wire. Easy-to-read LED indicator lights alert you to possible gaps in your signal transfer through each line, so you can troubleshoot faulty cables and repair or replace them as needed. This tester is easy to use, powered by battery, and includes a remote unit for testing of installed cable runs or long cables.