PRODUCT DESCRIPTION:

The Dyna-Flex Digital Speed Meter is compatible with the Dyna-Flex Powerball (blue and amber) and Dyna-Flex Pro plus models. It measures the user's instantaneous speed, highest RPMs, and maximum revolutions. It also includes a setting to measure your physical strength index in durations of 30, 60, and 90 seconds.

The Speed Meter easily snaps into place once the top cap is removed from the Powerball (use a flat head screwdriver on one side and a fingernail on the other side to gently pry off the cap). If your gyro does not have a removeable top cap, then this meter will NOT work for you. The battery for the Speed Meter is designed to last at least 3 years.

Athough the Speed Meter is optional, I believe this is a must have add-on for those that have even the slightest competitive instincts. Put a Speed Meter on a Powerball gyro and before long you'll have a contest with your friends to see who can crank out the highest RPMs. If you are really good, you can compete against the world! http://powerballs.com/scoreboard.php

Here is a picture of the speedmeter after being snapped on to a powerball: