As we delve into the world of welding let's take a look at the Welding Pen for PCBs - 18650. This portable and small welding equipment is designed for spot welding on circuit boards, and it boasts impressive features that make it stand out in the market.

The most striking feature of this Welding Pen is its high frequency capacitor with low internal resistance capable of withstanding high temperatures up to 105℃. The two-sided outlet is also a convenient design for spot welding, and it is marked in Chinese for ease of use. The red copper tube and aluminum oxide copper spot welding needle are of high quality and ensure over-current capability and durability, making it an ideal tool for welding PCBs.

One potential downside to keep in mind is that this package does not include a shell so it may not be ideal for those who want a complete set. However, the flexibility of not having a shell makes it easier to handle and carry around. On the positive side, the Welding Pen for PCBs - 18650 is a DIY tool, making it suitable for enthusiasts who want to work on their projects without the need for professional welding equipment.

Overall I would highly recommend the Welding Pen for PCBs - 18650 to anyone looking for a portable and small welding equipment for their circuit board projects. It may not be the most comprehensive set in the market, but its flexibility and high-quality features make it a great investment for DIY enthusiasts. If you need a shell, you can purchase one separately, but it's not necessary for the tool's performance. In conclusion this Welding Pen is an impressive addition to any welding kit.