It's like some people have a hard time chewing gum and walking at the same time. If you have to think about it, you aren't dowsing. I've heard of people singing nursery rhymes or doing simple math problems to take their mind off it.
As for meditation, it calms the emotions, reduces tension. In real meditation, the person tunes out outside influences, even minor pain. Not the same as hypnosis. Self hypnosis is delusional and probably responsible for many "dowsing" errors. People really want to believe they have found a Jesuit treasure or whatever.
Depending on which wave component you are detecting, a tuned pendulum can be as simple as a bar magnet on a string north-seeking end pointed down (don't know about down under) or horizontal. It has to do with the earth's magnetic induction which affects all things, not just ferro-magnetic.
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