That all makes sense, but: Isn't a pro likely to be inclined to keep the most correct portable USB brick with their portable soldering iron? They are universa

That all makes sense, but: Isn't a pro likely to be inclined to keep the most correct portable USB brick with their portable soldering iron? They are universal, after all -- at least downwardly. And what may be some examples of a "pro" soldering iron that uses a buck converter (or transformer taps or whatever) to be flexible to a variety of input voltages?