Thermal printer purchase

I want to buy thermal printer. With which I want to print tokens and coupons.

Which one is compatible with app inventor platform

Are you talking about something like this?

SX425

If so, I don’t get why do you worry about compatibility with the App Inventor platform. One is a software and the other one is a hardware and they have no connection with each other. Am I missing something?

Yes I need the similar item like this.

if you can controll it over bluetooth then maybe

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Check the following link, it might help you:

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Thank you very much.