The pen that spots mistakes as you write

A pen which vibrates when the person using it makes a mistake, could soon be used in the classroom.

The Lernstift or "learning pen", doesn't need ink or special paper to work and uses a special mechanism to work out what is being written.

It's connected to a mobile phone app that flashes to let the user know they've gone wrong.

It was invented by a dad for his son in Germany.

Falk Wolsky was inspired by his son Leon when he was first learning to 

write.

From CBBC newsround