Nice video Flapp. Mahalo for posting it.
Many of us have magnets salvaged from all sorts of devices.

The coin shops have some pretty impressive but expensive testers.

Here is one of the free coin apps I like to use.



As I understand it the testers only work on gold and can't tell the difference between gold plated or solid gold.
The shop owner told me he can often tell by the weight and sometimes by the color. If they make a coin out of a different metal and just plate it the weight wont feel right
 

Nice video Flapp. Mahalo for posting it.
Many of us have magnets salvaged from all sorts of devices.

The coin shops have some pretty impressive but expensive testers.

Here is one of the free coin apps I like to use.


....
I got a bunch of neodymium magnets if you want some.
I use them to make interesting refrigerator magnets ...for my kitchen photo gallery