The Triplett TDR100 Cable Length Tester is a precision cable tester that uses TDR (Time Domain Reflectometer) technology to measure cable length. \r\n\r\nIt can be used for any cable consisting of at least two insulated metallic elements, one of which may be the sheath or shield of the cable. \r\n\r\nThe meter has automatic internal matching networks to allow testing with an automatic selection range, which corresponds to power, telephony, CAT V, LAN, cables, and more.\r\n\r\nThe meter can be closely matched with the cable being tested using the function selection keys.