I have been digging bottle caps on the beach for a long time with the Nox, they usually come up around 14,15,16 and 17. This morning as usual i dug a 15 reading to be surprised with a beautiful 22k gold band weighing in at 6 grams. I didn't have my phone with me for a picture but will try to get one soon. So the moral of the story is dig everything on the beach, you might be surprised.