The packaging declares that the Cold Soldering Iron is appropriate for most electrical soldering with wires up to 0.5 – 1.0mm diameter, small jewellery repair and electronic projects (my italics). For best results, they advise to use 18-20 gauge/ 0.8 – 1.0mm diameter solder. This review describes the results of using a Classic Cold Heat Solder Gun to solder together a small electronic project, and it starts by taking a close look at the iron itself. It exhibits an electrical resistance and is a form of conductive high temperature compound. The tip is extremely lightweight, weighing only 2 grammes compared with say a 10 gramme bit of a typical traditional soldering iron. There is therefore very little thermal mass available in the Coldheat tip.