Meet the Gyro Grip: a centrifugal force fitness trainer that works your upper body hard. It has a 1lb internal weight that spins at speed up to 350RPM. It has a display to show RPM, time, and total revolution. You are alerted via audio tone signals at the end of each exercise.
The Gyro Grip not only works your arms but gets your heart pumping. The below video shows what you can do with this exercise tool: