soldering iron
Cold Heat

DIY Cold Heat soldering iron

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Do you remember that Cold Heat soldering iron that turns hot only when touching metal? Well, Instructables user photozz has put up a guide to saving $19.95 by making your own Cold Heat soldering iron. It is pretty easy to follow, and he even goes as far as explaining the science behind it so that you understand how it actually works. Just don’t burn yourself while making it.

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