Cable Length Meter Measures Length of Electrical, Data, Two-Wire and NM-B® Cables Up to 3000 Feet (914 m), TDR Technology Measures Distance-to-Fault, Open or Short, on Terminated or Unterminated Cable, Programmed With Velocity of Propagation (VoP) Values for Coax, Data, NM-B® and Other Multiwire Cables for Accurate Length Measurement Within +/-(2-Percent Plus 3-Foot/0.9 m) Accuracy, Stores Custom Cable VoP Values for Consistently Accurate Results and Time Savings, Simple Interface With Full Color, Interactive LCD, Tones Unenergized, Open-Ended Wires For Wire Tracing (Requires Analog Probe (Cat. No. VDV500-123, Sold Separately), Coax-BNC or High Quality Alligator Clips for Quick, Easy Connection to Test Most Cable Types, RJ45 Jack for Accurate Length Measurement of Terminated Data Cables, Measurements Can be Switched Between and Metric and Imperial Units, Includes (2) AA Batteries, Padded Carrying Case and Leads