Quickly & easily test your computer patch cords or installed cable runs to verify good connections or to troubleshoot problems. The PA70025 DataShark Network Cable tester from Tempo is a simple and easy to use cable tester for LAN (RJ45) and telephone (RJ11/12/14) cables allows you to check for continuity and correct wiring in seconds. Check patch cords or building wiring. The transmitter and receiver lock together for easy storage and have a pouch to keep the kit together.