Since a few guys had asked about this subject (Sorry so late Boomers dad) I just went out and tested a nice size 10 Men's wedding band I found last year.
Yes I went outside at half past midnight to do this.
On the Explorer it came in around a zinc penny or Indian head. "coin" signal.
When turnd on end it gave a lower tone.
On my CZ-21 water machine that gives 3 tones, it came in as a mid tone. (gold pull tab)
on the Exterra it said it was a little lower than a penny.
Given that I would say most machines are going to hit in the coin range.
Mike
Yes I went outside at half past midnight to do this.

On the Explorer it came in around a zinc penny or Indian head. "coin" signal.
When turnd on end it gave a lower tone.
On my CZ-21 water machine that gives 3 tones, it came in as a mid tone. (gold pull tab)
on the Exterra it said it was a little lower than a penny.
Given that I would say most machines are going to hit in the coin range.
Mike