What are hot rocks and cold rocks?
Rocks that either cause a metal detector to respond or to move its operating point further below the threshold. For a more detailed answer, click on the link below. Hot and Cold Rocks 6. Q: My detector makes a sound when I hold my hand next to the coil. I discovered that when I picked up a handful of dirt and held it next to the coil to see if whatever made the detector go off was in my hand. Every handful made a sound, so I held my empty hand next to the coil, and sure enough, it made a sound. The guy who sold me the detector says it’s the salts in my hand, but my uncle who knows electronics says it’s hand capacitance. Who is right and what can I do about it? A: Both the dealer and your uncle may be right. There may be two different causes for the the detector responding to your hand. 1) The expression “salts in your hand” refers to the fact that the human body is electrically conductive by virtue of the fact that it contains ionized fluids. ( This fact is also responsible for our sus
