Copper sulfate is a reagent that is used in textile dyeing, the preparation of azo dyes, wood preservation, and the tanning of leather. Description from mpbio.com. I searched for this on bing.com/images
GhostStop Ghost Hunting Equipment - Ghost Box Ovilus III 3.. Still another tool I think shouldn't be in your ghost hunting equipment box. It's great to experiment with it but with and have a little fun. But I actually wouldn't count this as actual evidence.
Testokool digital refrigeration service manifolds provide complete system information, pressures, temperatures and PT charts for all refrigerant systems. Description from cedar--rapids.com. I searched for this on bing.com/images