TRIPP LITE's T010-001-K multi-function cable tester is an essential tool for cable installers or anyone working in telecom or LAN environments. It allows you to test RJ45 (STP/UTP), RJ11, BNC and USB cable wiring, length, fault, and location, as well as common metal wires using the included alligator clip adapter. For instance, you can test the wiring for open, short, cross, reverse, and pairing connection. You can also track the location of an open circuit position, and determine the length of a cable—whether in a wall or on a spool—up to 4920 ft (1500 m). The easy-to-read LCD interface includes a calibration function that lets you load saved data. Powered by included 9 V batteries, the T010-001-K can find an RJ45, RJ11, BNC, or USB cable nestled within a group of cables. The auto-off function preserves battery power. The probe unit's LED flashlight is handy for working in dark areas. Included headphones help you work in noisy areas. When not in use, the T010-001-K can be stored in its carrying case.