A tactile marking pen is what you're looking for.
https://www.maxiaaids.com/hi-mark-tm-tactile-pen-black
Search found 2 matches
- 31 Jan 2019, 03:14
- Forum: Keyboards
- Topic: Add honing bumps/pips to F and J keycaps?
- Replies: 13
- Views: 7882
- 28 Jan 2013, 01:51
- Forum: Group buys
- Topic: [IC] DSA spherical
- Replies: 594
- Views: 125704