The Hive Bullion Exchange is offering a precious metal verification pingers.
This tool can help verify gold and silver coins, rounds, and bars using their resonance and frequency you can learn what the real deal sounds like but that comes with experience.
However there are apps available that can help anyone to do this test.
BUY
The price is 15 HBD for one random pinger and 2 extra rubber covers, shipping is extra and is dependent on you location.
For 1 HBD extra I can make one to order with the filament you want including the specialty filaments and specialized textures like in the example above(1)
Private labeling/drop shipping/Customization
The Hive Bullion Exchange offers private labeling and drop shipping as well as customization beyond filament color/bed texture (1) is a bed texture of a part carbon fiber filament
Right above are the regular pla's and below are the specialty, I have more color options available and can likely order the color you are looking for if it's not in stock.
Specialty filaments include (1) carbon fiber filled black/grey filament.
filament that changes color with heat and glow in the dark filaments.
Right below you can see the color changing filaments, I have a blue to white green to yellow and orange to yellow.
The same effect will work with your body heat after handling it it will start to change colors.
BUY/SELL PRECIOUS METALS WITH HBD & PRECIOUS METALS TOOLS AND ACCESSORIES
You can find out more about the #silvergoldstackers community in this post here