The RFID pen maps out the fields surrounding an RFID tag.

See the complete making of one cross section:
vimeo.com/862224

Great work by AHO interaction design students.

Great work by Chris Woebken.

More Field Drawings made with the RFID pen.

This pen is designed to help us map and visualise invisible radio fields from RFID tags. The pen only draws when it detects the radio field from an RFID tag.

RFID fields turn out to be perfectly circular...

It was made in 2006 by Schulze & Webb and Timo Arnall. This version is modified by Einar Sneve Martinussen.