Test Card F

Okay kiddo, so have you ever gone to a store and seen the cashier swiping a card through a machine to pay for something? Well, sometimes those machines need to be tested to make sure they are working properly. That's where a test card, like test card f, comes in. It's a card that is made specifically for testing those machines, so the people who work with them can see if they are working right or need to be fixed. It's kind of like going to the doctor to get a check-up, but for the machine instead of a person. And test card f is just one of the many types of cards they use for this sort of thing. Pretty neat, huh?