Klein Tools VDV501-829 VDV Commander Tester with Test-n-Map Remote Kit Locate, test and measure coaxial, data (RJ45) and telephone (RJ11) cables Identify wiring faults including miswire, open, short, split-pair, and reverse-pair Detect, identify and test Power over Ethernet (PoE) Measure cable length and distance to a fault with Time Domain Reflectometry (TDR) technology Four tone options with probe included