Heard of the eNotate devices.
Perhaps explains why demand is high for them? :-)
Agree is daft of USCF to sanction electronic devices. Totally unnecessary & a pencil does indeed suffice.
http://www.chess.com/forum/view/chess-equipment/chess-notation-devices
http://www.grantland.com/story/_/id/8362701/the-evolution-cheating-chess