CW2200MTP - Chemtronics - Pen, Conductive, with Micro Tip
CAIG CW100P Circuit Writer Conductive Pen
Pen Dispenser: For Use With Circuit Board, Silver, Silver Conductive, Includes Pen - Grainger
Amazon.com: Circuit Scribe Non-Toxic Conductive Silver Ink Pen – Award Winning Design That Makes Creating Circuits and Switches Easy As Doodling – Writes on Any Paper! : Office Products