Hello My son-in-law tells me he once used a device , he calls a toner. It's for trouble shooting , broken wires/cables , bad connections etc. I can not find any info on any electrical test equipment called a toner. Does anyone have any info on this device? The manufacturer etc. Are we using the proper spelling(toner)? I'm assuming it generates a frequency along the circuit , then you take the hand held unit to find the broken wire. Thanks in advance. ron
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19 years ago