Soldering Rosin Flux Pen.

The Kester 951 Soldering Rosin Flux Pen is a professional-grade soldering accessory trusted by electronics technicians, engineers, and hobbyists worldwide. Its no-clean flux formulation helps eliminate oxidation, improves solder wetting, and promotes smooth solder flow for cleaner and stronger electrical connections. Featuring a convenient pen-style applicator, the Kester 951 Flux Pen allows precise application of flux directly onto pads, component leads, wires, and connectors without excessive mess or waste. The low-residue formula leaves minimal residue after soldering, making it suitable for applications where post-solder cleaning is undesirable.