Amprobe LAN-1 LAN Cable Tester is used for testing opens, shorts and miswired cable installations. This LAN Cable detector can work with various data cables and connectors. This cable tester provides a quick go/no-go LED display of the wiring and connection of items under test. You can either step through the test cable wiring one at a time or have the unit automatically pulse through the pin-outs and display the results.