I was in the mood for some exercise, so I went out looking for common loot, figuring lots of knee bends will help with shedding some weight. The Scorpion is a coin vacuum in my neck of the woods. I did some air tests with it. If you crank up the AUDIO knob above threshold in AUTO mode in all metal, you can easily get an audio sound on a penny past 14 inches. Not bad, however, I don't know if it will do that in a soil matrix. I may try getting some stats with the Scorpion in my test garden one of these days.....