Quote:
Originally Posted by Geo
Hi Qiaozhi.
The answer is simple...... I don't know  .
It's the same if I have a coin buried, or it is upon the ground. But it is different if is in the air. Sometimes detects a coin in the pocket but more times no.
Regards 
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What happens if the coin is 100mm above the ground, for example, with the PD kept at the same angle to the ground?
I'm just wondering if the PD needs to be kept at the same angle, as a coin held in the air would cause you to hold the PD horizontally.