Albert watch the same dudes videos. One of them he is referring to is a buried rusty washer about 4 inches or so. Almost every machine I've seen will hit that the same way. Call them a coin. Even in that video the legend is still giving enough info that you can tell its something big. He also does another one where he had a rusted up wrench peice and puts it next to dime. Not saying the vid creator is doing anything wrong, but some of these vids you need to take with a light heart. Especially with test like the nail board that are extremely tuff tests. Also the camera doesn't do the detectors justice with the audio. I learned that long ago, cameras only seem to capture and transmit about 65% of what's actually heard. Kinda like using a machine with a really bad external speaker and then changing over to a really great set of headphones. Big difference. Here's the other vids

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