The high-tech LANsmart TDR Cable Tester detects, locates, and displays basic wire connection problems including opens, shorts, miswirings, reversals, split pairs and shield continuity for RJ45, Cat5, Cat6, UTP and STP. Plus, it measures cable length for UTP and STP cable without remotes by using TDR (Time Domain Reflectometer) technology in real time. LANsmart displays the results in a pin-to-pin format.LANsmart#039;s built-in tone generator (probe not included) will also send signals to all or just selected pins or conductors to help find the corresponding cables; users can send out auto-negotiation signals to find the corresponding hub/switch ports. LANsmart is compact, ergonomic, and easy to operate.Its built-in PORTfinder locates corresponding jacks on hubs/switches, and it increases measuring accuracy with its Velocity of Propagation Adjustable Calibration ability for non-standard cables. Displays test results in pin-to-pin/wiremap format, and in both meters (m) and feet (ft). Battery operated, compact and easy to use. The advance functionality and versatility of the LANsmart make it an all-in-one tester suitable for all professional technicians and installers.