use code FREEDEL
Science Museum strength ball. Using hand rotation, spin the internal gyro and challenge yourself and others to achieve the highest revolution per minute. Pull the re-cord to spin the gyroscope inside the ball. Rotating the ball increases the rotation of the gyroscope. The digital counter measures the speed of the gyroscope and displays the number of revolutions per minute. Challenge friends and family. Good training for golfers and racket sport enthusiasts. Gyroscopic exercise ball, 2x LR41 1.5V batteries included and pull string. An ideal stocking filler, suitable for ages 10+.
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