ERROR FINDING PEN

ERROR FINDING PEN

Vibrating pen picks up mistakes as you write.
A writing tool from Lernstift capable of  picking errors in writing.
It means that the pen can vibrate  when it  encounter  any spelling  mistake or any improper formation of letter.
In calligraphy mode it detect the deformation of letter  by comparing the letter with the reference one(nothing but they are already programmed with all letters), on the other hand in orthography mode it check the spelling