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That is used by the telephone company for tracing cable pairs (usually with old paper insulated lead cables because they are not colour coded). You dial into a special number provided by the telco with your butt-set and it will send out a tone over the pair or group of pairs from the central office, you touch the probe from pair to pair till you can hear the tone in the headset. You can also use an exploring coil which you can use to identify cables underground or through splice cases. These are usually used by cable splicers not sure if you could use it with a tone generator or not though, might be a little useless to anyone unless they are splicing telephone cable and without the number from the telephone company for the 577hz tone!