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The Klein Tools VDV500-820 Tone & Probe Pro Kit is designed to cater to both professional and home users. With its exceptional cable tracing capabilities, you can effortlessly trace cables spanning over 1,000 feet. With the VDV500-820 model the Bed of Nails clips ensure secure attachment to wires, while the RJ11 plug seamlessly connects to telephone and RJ45 data jacks, allowing you to tone wire pairs with utmost ease.