How Can I Tell if a Credit Card or Passport RFID Sleeve Is Effectively Blocking Reads?

And is there a specific sleeve that you would recommend?

—Name withheld

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It is very easy to block radio waves from reading your RFID-enabled credit card. Given that fact, I would say that virtually any sleeve should work. But you don't need to spend any money to protect yourself from criminals. Simply wrap the card in ordinary aluminum foil or Mylar. This will do the job fine, without the need to waste your money.

—Mark Roberti, Founder and Editor, RFID Journal