How can comprobe if LRL rods works

[Geo]

Originally Posted by Qiaozhi

Yes - it may appear to you that the dowsing rods are working, but it is a "trick of the mind".
If you take the time to set up a double-blind test, you will find that the effect disappears.

Hi Qiaozhi.
I can't understand why is trick of the mind???
Yesterday afternoon i received a signal with my L Rods at my farm. I dig it (last time i spend my time at farm so it is very often and easy for me to dowse or to dig) and i found a piece of copper about 4 cm. i received the signal from 20m distance and from all the directions.
So were is the trick of the mind ?? Why to do a double-blind test ???
Of course there are times that i take signal, but i find nothing. If we stay at the times where we find any object (small or big, gold or iron), i think that it is time to study the phenomenon.

my regards