The Triplett TDR1 is a precision cable tester that uses TDR (Time Domain Reflectometer) technology to measure cable length. It can be used for any cable consisting of at least 2 insulated metallic elements, one of which may be the sheath or shield of the cable. The meter has automatic internal matching networks to allow testing with automatic selection range, which correspond to power, telephony, CAT V, LAN, etc. cables.The meter can be closely matched with the cable under test using the function selection keys. The velocity of propogation value (V.O.P.) can be similarly adjusted to match the cable under test, ensuring an accurate distance measurement. It features a 2.4” TFT color display with an easy-to-use onscreen menu, 2 built-in groups of standard cable V.O.P. (velocity of propagation) values, and 99 memory locations store traces for future analysis. An Auto-Sensitivity function provides a closer match to a wide range of cables with only the V.O.P. settings required. The meter comes complete with 2 AA batteries, BNC (M) connector to standard test leads, BNC (M) connector to alligator clips, BNC (M) connector to (M) F connector, and carrying case. 1-year warranty.