External Heated Electric Soldering Iron Gun Hand Solder Tool Kit 40W Features: Professional soldering tool is great for lead-free soldering semiconductors Lightweight and easy e. Ideal tools for computer motherboard maintenance. Specifications: Package Weight: 88g Package List: 1 x Electric Soldering Iron Note: 1. Keep the welding nozzle head always covered with tin. 2. Do not use strong acid flux when soldering tin . 3. Do not use a rasp or hammer to setbacks and beat the tip. 4. In the presence of non-stick tin, polish the welding nozzle by fine sand skin, and then infiltrate it with flux, finally paint tin 5. When electric soldering iron is energized, it is strictly forbidden to disassemble its electric parts. 6. When the soldering iron is used for the first time, here comes out a smoke from end of the tip, which is normal and will naturally disappear in ten minutes. 7. When using electric soldering iron, a soldering station with a natural cooling structure should be equipped.