4XEM Professional RJ-45 RJ-11 Network Tester Cable installations are a difficult and at times tedious ordeal. 4XEM Professional RJ-45 Network tester has been designed to help make the process smoother. 4XEM has crafted a lightweight and travel sized tester that can test a variety of cables; RJ-45, RJ-11 and even BNC cables are able to be tested efficiently with this device. Battery powered for on site convenience this device tests for Straight-through connections, short, crossover and others. Makes sure your installations are to your specifics or add another tester to your arsenal with 4XEM. Problem it solves: Makes sure your cable configuration is exactly what you need it to be during your professional RJ-45 or RJ-11 installations. NOTE: NOT FOR USE ON LIVE OR POWERED CIRCUITS. MAY DAMAGE UNIT