Bought my wife a Coin master GT, for xmas, we are visiting Massachusetts and the weather was warm when we got here, so I gave it to her ahead of time.
A quick test, factory preset sensitivity, and discrimination set for iron. With auto tracking it was a breeze for her, except she needs to remember to hit the all metal button after pinpointing to reset to discrim.
The soil was about 6 inches of black top soil, and then it changes to sand. She found 1 zinc I penny at 6 inches another at 10, she kept getting a silver signal, loud and clear, it registered at 10 inches, but nothing there. Dug deeper and we pulled out a one inch screw with a large head. This was at a good 12 inches.
Later another 10 inch reading came in and it was a tiny piece of a metal snap like you find on clothing.
I am anxious to see what this machine will do in the mineralized soil of Panama when we return. So far it seems like a sensitive machine.
My guess it was the depth on the screw that made it come in as silver. EIther way the signal was loud and clear.
Happy New Year to all