The Ideal Electrical 62-200 Linkmaster RJ-45 Cable Tester is a basic wiremapper for identifying wiring and continuity errors in twisted pair cabling. Colored LED lights identify pass/fail conditions of each pair of wires in RJ-45 8 conductor cables. Users are provided with a tool that can identify the following errors: shorts, opens, miswires, reversals, and split pairs. This unit is designed for use with CAT3/5/5e/6/6a cables.