This is the mechanical pencil which will deposit a fractional amount of sand (included) on a playing card which enables later location. 

A spectator shuffles and ordinary deck of cards (not supplied) and then cuts the deck into two or three piles, he selects a card from any pile and places it under any pile he chooses.  He now assembles the deck and performer without touching the deck locates the selected card!  The Radar pencil reveals cards that are hidden in a deck that is not touched or handled by performer. 

Includes instructions. Condition very fine.