Solder Pro on Instagram: "The video depicts a person performing electronic rework, specifically using a soldering iron and a flux pen on a printed circuit board (PCB). Activity: The process appears to be either soldering or desoldering electronic components on the green PCB. The blue tool is likely a flux pen used to apply flux to the joints for better solder flow, or possibly a pen with a solvent like alcohol for cleaning the board. Circuit Board: The main green circuit board is a power supply