Good sturdy case, cards (with or without microcontroller) fit tightly and securely. The sealing edge is tight and definitely waterproof. But I will not test it for waterproofness. I didn't dig into the hinge (because I want to use that one) but it looks like it's a plastic or rubber hinge. that can be a problem after opening and closing it a few hundred times. All in all, this is practical, reliable protection at a reasonable price.
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