The Nikon Loupe is the most recognized brand for detailed view to determined authenticity of an amulet among most known experts.
Amulet collectors should have 1 with them all the time. Even if you don't know how to use it, but sellers seeing you with one will think thrice before trying their "trick" with you 🤭
Jokes aside, these are bought directly from it's country of origin, Japan.
I only have 10 pieces to spare.
Do get it quick