RayFinder Long Range Locator

[BlackHand]

http://www.youtube.com/watch?v=wvJGs1gtlEU

Curious if any of you have an oplnion on this machine. Seems to be in two parts (i) the first is a rod that one inserts into the ground. (ii) The second parts strikes me as a dowser. Just exactly how does both of these corelate?

Does anyone have a personal experience with this particular machines and are there other manufaturers with proven technology (but not expensive).

I am trying to decide on a an inexpensive 3D ground scan and a retailer recommended the above to me.

Your suggestions are most welcome.

Thanks for your attention.