Thought I would see if the V3i and ultimate coil could hit a quarter in the ground at 12". I filmed the settings and me burying it with a ruler to 12" but the camera messed up and I did not get any of that footage. I ground balanced the detector before starting. I think the depth was off because I had previously used the 4x6 and did not change the coil selection to the bigger one.
https://www.youtube.com/watch?v=8fSezDqlreo&feature=youtu.be
https://www.youtube.com/watch?v=8fSezDqlreo&feature=youtu.be