Close-up Cardiographic (Gimmicks and Online Instructions) by Martin Lewis

"I have always wanted to present a close-up version of Cardiographic but have been unable to create my dream pad until recent advances in material technology made it possible.
"My criteria was simple, I wanted a pad that would comfortably fit in my pocket. That could be done surrounded under the closest scrutiny. It had to be self-contained and needed a fast reset for strolling, and most important of all, it had to look impossible."
- MARTIN LEWIS