dear fun finder the box and the loops should be sheild . and you can adjust the hight of metal detector easily the detector loop can be adjuted to be 30cm above the ground and the other loop must be adjusted this metal detector can find a car in 12m easilly ( in the ground )
- If the box is shielded its even more metallic!
- do you think 30cm above ground will be much better? The coil(s) have to be 5-10cm above ground!
- 12 meter!!!! for a car !!!!??? With such a little metal-infestest 50cm mini-coils-construction?! Are you kidding?
Hahaha !!!Who told you such crap? If you haven't tested it by yourself and with buried stuff don't believe and tell it!
In such a case you would need a 5 times !!!! stronger and highly stable EM-field and the coils have to be at least 2m away
from each other!
Whats good about such detectors is that those are mostly nonmotion induction balance ones that even can detect cavity
if they have not been crippled like the new Whites 808.
But they should have been concepted much more"cover a huge area in a short time"-friendly and not as:
"Walk with some coil-construction like an umbrella in your hand over the pampa!".

Have fun with your experiments!
@ kt 315 - metal screws directly close to the coil...

At least those small coils can be held much closer to the ground - this is really good.

But vertical with horizontal still doesn't match! The 3 dimensional field of EM-waves has to be at the correct orientation.
Even the LNB for a satellite must to be adjusted from some degrees to over 30° if its located not directly south.
@ whoever, everyone, all or generally spoken:
Back to the main question: a 15cm x 15cm square or a metal plate with 15cm diameter of course is detectable @ 2m (6 ft)
but only in air so far! Adjust your P.I. with 75cm coil to high critical and listen to the slightly faster geting knocking-pulses...
Just this doesn't work with buried stuff if it isn't buried below 2m of wool, wadding, hay, nonmineralic glass or dry sawdust.

Realistically seen you will find metal in such size only at ca. 130cm buried if you walk at a dry day
very slowly over not very strong mineralized soil with a detector that has at least some 45cm coil!
And if you hold your "2 box" (I wonder where it has any boxes at all...) 50cm over the ground you will never find a
15cm thingy below 50cm because it makes a big difference that there is not much air inbetween coils and floor!
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