At this point you’ve almost certainly seen one of these low-cost portable soldering irons, perhaps best exemplified by the TS100, a pocket-sized temperature controlled iron that can be had fo… ...

Took a pair of pliers and tried to unscrew a heavily oxidized tip. FWIW, it's the Radio Shack 64-2055 iron. The tip snapped :facepalm: :facepalm: :facepalm: What's left of the tip is completely ...

The iron also has interchangeable tips, just like any other soldering iron. I was intrigued to see what looked to be a 3.5mm headphone jack used to interface between the iron and soldering tip.