Technology: The pen that checks for spelling errors on PAPER and vibrates when you make a mistake

The computer inside the battery-powered Lernstift is an embedded Linux system. The board contains a non-optical motion sensor, processor, memory, Wi-Fi and vibration module, pictured. The refill can be replaced and the switch takes the pen from Orthography to Calligraphy Mode

A pair of German inventors have created a digital pen that can check for spelling mistakes in handwriting.The Lernstift, pictured, has a built-in sensor that recognises writing movements and tracks the shape of the letters to trace words. It then vibrates when a mistake is made

If a spelling mistake is made the pen vibrates to alert the user

Future models will additionally check for grammatical errors