These threads get quite formulaic, but at least this one is moving along. We're already at the "oh, it won't work if the situation is other than one I control". It usually takes us five hundred posts and a week to get to that stage.
SaskMick, listen to the good folks here. They have considerable experience with this. The Foundation has tested dowsers as have many national skeptic groups in other countries. To a man and woman they (the dowers) have failed. I think it was Randi himself (or someone else from the Foundation - other posters can correct me) who noted that the most surprised person in the room after the tests has been the dowser. Dowser's aren't con artists, generally; they actually believe they can do what they claim. They may have heard about the idiometer effect but they think it applies to other people, not to themselves. And never having tested it or studied it, they are sure to a high degree of certainty that what they are experiencing is real dowsing.
So before you expect us to believe something we've seen disproved numerous times, be aware that you're going to have to offer more than a Youtube as "proof". Where are you located. There are skeptic societies in all sorts of cities/towns and it might be possible for one of them to conduct a double-blind test with you. They will not come do it at your abode where you can point to pipes in the walls or under the driveway, but will do it at an agreed upon (by you and them) neutral location and with a set of criteria that you get to sign off on BEFORE any test is conducted.
Be warned, though.... this is the exact test that numerous dowsers have failed. Dowsing has, thus far, a 100% fail rate under controlled testing.