I was joking with a friend about how deep the AT Max will detect and told her that I would be digging Chinese coins. Well, what do you guess would be the first target I dug with the Max? Yep...a Chinese coin (or replica of one). Granted this thing is small and it was down about 9 inches in sand at a freshwater lake but the Max just nailed it solid...never a doubt. It fell through my scoop three times before I was able to identify what I had. Funny how things work sometimes.