Isaac Betts provides statement to Arthur Deming on Joseph using a peep-stone for money-digging.
Statement by Isaac Butts in Arthur Deming, Naked Truths About Mormonism 1, no. 1 (January 1888): 2
Young Jo had a forked witch-hazel rod with which he claimed he could locate buried money or hidden things. Later he had a peep-stone which he put into his hat and looked into it. I have seen both.
Website is not the original source.