A nice digital stylus pen from ESR which can be used for iPad (2018 or newer).

This ESR Digital Stylus is incredibly accurate thanks to the very small tip of only 1.4mm. Which makes it an obvious choice for you who are looking for a stylus to draw or work graphically with.

The pen is extremely sensitive to pressure and inclination, so you can easily vary the thickness of the line, create discrete shadows and a wide range of both creative and artistic effects - just like with a regular pencil, but with incredible accuracy.

It is incredibly easy to use, just turn on the button and it is ready to use.
The battery charges quickly and lasts a long time, it only takes 1 hour to charge it, after which it can be used for a full 13 hours before it needs to be recharged.