Yes, we tried it in different parts of the state even. I haven't touched the threshold tone.
I think the must frustrating thing is that out of the box, my son found a ring and a knife. He is 13yo and didn't mess with any settings or anything. After that, we put it away, and the next week we tried finding stuff around our home (on a golf course so lots of change falls out of pockets around here). And the thing just kept beeping. Took it up to the mountains, same thing. Even back to same property he found ring/knife and same thing.
We loved the ease right out of the box, and now its just super buggy. For a 13yo trying to get into the hobby, his interest quickly fades if something isn't working... lol