We shouldn't call this stuff locators or detectors, but: guessers.
If they work at all they work on the "pipe locator" long-wave radio wave concentration or
reflection principle, passive (without transmitter) or active.
And some are also detecting distortions of the earths magnetical field.
So those detectors are far away from reliability and it's no wonder that all of the
producers or sellers of them avoid scientifical testing at all costs!
They don't wanna get a proven "it does not work"-certificate, it would ruin all
their efforts, their business and in what they believe.
Holding dowsing rods is the same absurd as holding a crucifix to detect with it
what person is possessed by demons! People feel or detect alot if they have too much time!
What in 100 years really could, I say "could!!!" work, is perfectionated backscatter-
technology. It would work like reflecting radar but on very "sharp" x-rays or even
gamma-rays which can penetrate the ground also from a larger distance.
But the receiving unit must have extreme high definition and methods like
with satellite-signals to concentrate the weak signals will not work because
most of the reflected waves will go straight through the metal.
Modern usual GPRs work with signals from 3 to 300 MHz,where the shorter waves
can not penetrate the ground much deep but have better resolution for smaller
objects while the longer waves are for deeper and larger structures.
But more than 5 meters (15 ft) they can not penetrate with reliable results.
The main thing that is going on here in this forum is providing unprovable claims
from those who are shure they have working LRL-devices!
All of them ignore the possiblity that the creator of this forum would test those
as real working presented devices!
Of course they must refuse such an offer, because they know how unreliable
their stuff works! And all those "I have bought a LRL and it is real working" guys here also
refuse to give away their wannabe working LRL to a real test!
What do they have to lose?
Are they afraid that someone could discover them as liars or sweettalkers or even
as promoters for those from where they got their stuff?!
Clear electronical work looks different! There is absolutly no doubt the Playstation 4
works! Even all those new video games have to be test-played many times before
they are allowed to hit the market!
Those LRLs are more like Alladins wonderlamp! Pseudo-electronical Fairytale-products!
Some sort of wishdream of mankind that in almost all cases remains just a wishdream!
And for LRL believers perhaps the land around Syria and Irak could be a fine place -
there are many hidden treasures and many believers, too....
From this region everyone can learn to what results stubborn believing leads!
