This handy cable tester from allows you to easily test Ethernet cables up to Cat6 specifications. The NTL-100 can test for opens, shorts, miswires and polarity on both straight through and crossover cables. It utilizes large, easy to read LCD display so you can quickly see test results on site. The durable construction stands up to daily use in wiring closets or anywhere cabling needs to be installed and certified. Programmed with most common wire maps, it simplifies troubleshooting of cable issues down to a single button press. Integrated RJ-45 jacks let you test cables without removing connectors. Conveniently powered by batteries so you can check cables anywhere without hunting for outlets. An essential tool for network technicians, installers and IT professionals.