High-tech pen checks spelling while users write
From: IEEE Computer Magazine - 09/2013 - page 27

A German start-up has developed a prototype pen that alerts users if they
misspell a word while writing.

The Lernstift ("learning pen" in German) is a digital pen that contains a
small Linux computer powered by AAA batteries.

It uses a calligraphy mode to vibrate when a user writes a letter incorrectly
or illegibly, and an orthography mode to vibrate once for a misspelled word
or twice to point out a grammatical error.

Lernstift officials say they designed their pen primarily as an educational
tool that could, for example, help children with dyslexia.

Read the entire article at:
http://www.computer.org/csdl/mags/co/2013/09/mco2013090026.html

Links:
The Lernstift smartpen checks your spelling as you write
http://www.cnn.com/2013/07/19/tech/innovation/spellcheck-lernstift-pen/index.html

Lernstift
http://www.lernstift.com/index_en.html

Lernstift, the first pen that vibrates when u make a mistake (with videos
  0:19 & 0:30)) 
http://www.kickstarter.com/projects/lernstift/lernstift-the-first-pen-that-vibrates-when-u-make