Have a computer\laptop that you’re not sure if the USB ports are working well that it might damage your precious USB sticks? Here’s your answer.
brunoip from INSTRUCTABLES made this 5 steps tutorial which helps you building up a small USB tester that if it went on full power constant green and a message from your OS said “USB Drive detected”, you’re good to go. Otherwise, it might not be safe.
Materials are available and shouldn’t cost much even here in Kuwait.