Good luck on that one. I've designed and built all sorts of dowsing devices. I'm not going to waste my time selling them and I don't want to see people unhappy when they fail to do the necessary work involved to learn and keep in shape. They say it's human nature to be lazy and man is that trait ever brought out in wannabe dowsers/locators. I really think some people think they can learn it while out in the field searching for treasure! And I have to say a lot of people just think they are smarter than someone who has done it. That's total ignorance to the truth and dowsing/locating is all about the truth. Everyone's bias' blind them from the truth. That's what they talk about original sin. You gotta burst the ego bubble. And about 99.999% of everyone never accomplish this.
There's a lot more to it than learning how to use the L-rods. It's all about self-mastery. And like the saying goes, "If you think it is easy to change somebody else, just try to change yourself first." That's why i say it is imperative and essential to learn some form of meditation, and that's why people say you don't need it.
Well, i don't feel like getting on this subject. I could spend weeks discussing it and barely scratch the surface.