people I'm using L-rods too but they don't have nothing to do with north or south. neither with magnetic pole of the earth. It has to do with antimatter .may be some of you never heard about this word.it means that everything in this world has a reflected picture which is identical to it.like when you look at yourself in the mirror you see yourself. therefore, if there is a treasure be sure it's reflection is above the ground.from my experience I notice that the reflection is spreaded in a vertical and horisontal way.I'm sure of this because I can determine how deep and how big is the treasure horizontally and vertically.moreover now the shape of it, was it a box or a jar.
in what concerning l_rods. they don't do nothing but it is your body who get the signal first then translated with l_rods. if you don't believe me, you can use L_rods from different materials like copper, plastic moreover wooden rods. they will give you same results, though wooden one are better in finding cave ,tomb or even empty area under ground.
when you are dowsing or looking for a treasure.it is a mistake to use bare L_rods without handles.use pen's tube and let the rods to move freely while dowsing.worse than this is catching samples of metals to detect in hand.there are techniques I can't fortunately reveal in here for the moment.however I'll show you some negatives to avoid.for instance:
-humidity: lol l_rods detect this as a viod underground. to solve this problem fill your mouth with water . the humidity will be automatically vanished
-viod: be sure that if there is cave under your feet and there are treasures inside of it. you won't be able to detect what you have inside it .all what your l_rods detect is the void limits.to see inside the void you have to canceal it. the silliest way to get rid of it is to fill your mouth with air.
-why we shouldnot use metal in bare hand.just because the ground it self if felt with iron and metals that are alike to what you have in your hand. that-s why your l-rods make X over any area where soil seems to have same frequency as the sample you are using.
if you find something with l-rods .before you dig to see what you find, use this silly way as a measurement. one ring of gold can give you a hallow of 1m² ,means. you will get a hollow of 2m tall on 2m wide.
and so on....I'll need ages to describe and show you how to avoid negatives of rods.
folks that's all what I can say now.use your brain to reach the truth, which I'm sure doesnot exist online or even books you buy with money