Toolcraft 8W/12 V. Soldering Needle. Highlights & details. Perfect for finest soldering work. Description: This micro-soldering gun (soldering needle) is designed for the finest soldering. Multi-purpose application, like for example: model train or smallest SMD soldering. Technical data: Soldering tip temperature: 425 C. Operating voltage 12 V. DC/AC. Power 8 W.