The PowerBall is “the world’s most powerful hand-gyroscope,” intended for RSI rehab and geeky fun:
The Powerball is started out at about 2,500 rpm and is slowly worked up to speeds over 13,000 rpm. It’s a lot of fun to see just how fast the Powerball can rotate. There is a digital display built into the Powerball that can display the realtime rotor rpm as well as store the highest achieved rpm – a high score which will remain in the memory until you achieve a higher score or clear the memory. Use it around the office to see who can achieve and maintain the highest rpm speed. You will get tired with your repeated attempts to continuously get higher and higher rpm speeds. It’s a lot of fun and dangerously addictive. (Chris is the current ThinkGeek high score holder, with almost 12,000 rpms).
(via Smartpatrol)