Tempo Communications 701K-G Tone and Probe Tracing Kit. Take your low-Voltage wiring game to the next level with Tempo’s line of tone generator and wire tracing probe kits – essential tools for today’s wiring technician. With superior functionality, these sophisticated kits allow you to check for voltage on low-voltage circuits like telephone, data, or security alarm connections and generate a tagging tone that is picked up by the probe – giving technicians unbeatable access to hard-to-find lengths of cable.