Cap - stylus for capacitive screens

As you know, capacitive touch screens use the fact that objects of large capacity (including you and me) conduct alternating current. So, to make the stylus work, you need the tip of the stylus to be electrically connected to the body.

The idea is simple: we take a metal ballpoint pen and put on such a cap here: It is made of a small cloth soaked in very salty water, covered with a thin plastic film, and fixed to the pen with black tape. Demonstration video:










PS An American survivor of a thumb operation is dedicated.