The Signature 500 is unique in its ability to test installed cables for opens, shorts, mis-wires,
and proper twisting of twisted pairs. With one unit plugged into each end of an installed cable you can learn, test, and print from either end.
While not a strict Cat5 cable tester, the low cost Signature 500 easily tests for the most common defects you'll encounter with your LAN network cabling: wrong twisted pairs, opens, shorts, and intermittant connections. With two testers you can even check installed LAN cables.
If you need a low cost cable tester for USOC systems (such as 10BASE-T, Token Ring, or ANSI X3T9.5 TP-PMD) consider the Signature 500 and set of RJ11, RJ45, or RJ48 adapters.