Can I take a card writer through the airport?

yes as it is legit worldwide, just you need to declare it

What do you mean when you say declare it?

declare it as electronic device and do not take it with you in cabin luggage.

Okay so as long as it is in my suitcase I'm good?

yh, as i said just buy additional luggage, and put it there, i always travel like this never had any problems so far

Okay thanks bro