Soldering Iron....

I like my butane one from Snap On. You can get different brands of that type though, I think Weller might make one. They come in a case. I use mine a lot, works good.

What's good about the butane ones is there is no electrical cord to deal with and they heat up pretty fast.

The Snap On one also has a variety of tips. I like the torch tip for heating shrink tubing. A heat gun works for that too and you don't waste butane but I use it anyway.