For soldering wires in places beyond an extension cord, or for burning stuff with fine details I use this butane-fueled micro torch. It is like a propane torch, only 10 times smaller. The micro torch generates a tiny, precise, very hot blue flame. Uses typical butane refill liquid. It’s lightweight and agile. But unlike other self-igniting micro-torch models, including the previously-reviewed Weller Portasol, or the ones used by jewelers, this one is cheap at $12. It is good enough for the occasional heating I do.
A cool tool is anything useful that is superior to comparable items. If you think this tool is inferior suggest a better one. You are welcome to insult a tool, but comments containing insults to individual people will be deleted. Corrections of fact are always welcomed, if stated politely. Recommendations of better tools are dearly wanted and may be elevated to the front page.