Tune an AM radio to an empty channel (lower is better) and hold the ground probes near to it and listen for a tone. Or you can plug in a set of headphones into the reveicer where the L-rods hook in and listen for a tone when near the ground probes. If you hear a tone it is working and you need to learn to use the L-rods. Did you get the set of instruction that came with it? Good info on learning to use the rods and other important details.
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