You can buy a cheap signal generator for under $30. Battery operated. Just remember it is 80% operator skill and knowledge. And that is assuming you have everything correct and know what you are supposed to know and have good locating conditions. They've been around since the 1980's. Nobody even wants to talk about them any more. Dell Winders, one of the pioneers in MFD, quit selling them. Said they don't work reliably any more. His advice is don't buy one.
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