Review on 🖋️ Hakko FS-210/P 4ml Pen Type Flux Dispenser: Precise and Convenient Flux Application by Scott Gafur

This product is great for applying a small amount of flux to a tiny area. However, you will need to sweep the contact multiple times to get enough flux to work. The reason for only 4 stars is that if the tip of the brush even briefly touches the soldering iron, it will melt it. A few bristles together and the brush will start to stick when applying flux to wire tips that are around existing connections when repairing/reflowing/modifying existing electronics and circuit boards. That downside aside, I would recommend this product and a bottle of flux type pre-filled flux pens.