LERNSTIFT: THE DIGITAL PEN THAT CHECKS SPELLING ERRORS ON PAPER, EVEN GRAMMAR IN THE FUTURE, HAS BUILT-IN Wi-Fi AND CAN CONNECT TO YOUR SMARTPHONE OR PC

The refill of the Lernstift can be replaced to turn it from a ballpoint pen, pictured, to a fountain pen or pencil

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