Need help checking sd card bought from amazon

[D C]

How to check if the sd card is genuine and has the rated capacity and speeds?
I feel sd cards cards are easy to fake and need a careful eye to lookout for fakes.
Thanks.

 

[Asteroid]

the best way to test for authenticity is to refer a picture of the same card and if the font and text look identical, the text print should be clear and not fuzzy. for spped test, pop the sd card in a usb 3.0 card reader and run a speedtest with crystal diskmark , or just put it in an androdi phone an use some app to benchmark it. check if its +- 15% the speeds advertised by the manufacturer. should be enough to verify authenticity.