SonarPen design is completed!!! by wpmaster 09/09/2017 Design 0 Finally, after two years of research and prototyping, the #SonarPen is finally here! It’s smart, it’s pressure sensitive, it’s affordable, and it operates without batteries. Introducing the #sonarpen for all iPads at US$29.95! https://www.instagram.com/p/BY0j5cDh-gK/