Perform some mindblowing routines with real and virtual ESP cards. This trick is available as a part of the BS Magic tricks collection. Developed by Benke Smith for both Android and iOS.

Facebook group: https://facebook.com/groups/esp.test.bsmagic

You can buy nice quality cards for this trick from Electricks:
https://electricks.info/product/marked-esp-test-cards

Or you can also print them by yourself (you'll get the download link after the payment for the app).

You can also use any marked ESP cards for the routine.