How Does it Work?

All golfers look for a few extra yards in their drives. The length of a drive is a direct function of the Coefficient Of Restitution (COR) of the golf ball— the higher the COR, the farther the ball will travel. With the BestBall, the golfer can select balls which have the highest COR for long drives, or select balls that all have the same COR values, for consistent play.

Most golfers are happy to find balls that were lost in water hazards or the rough; this ball tester will confirm whether those balls are suitable for play.

A golfer who bounces two balls to see which bounces higher is doing a simple COR comparison. Simply stated, COR is a number that indicates how well a ball bounces or rebounds. A perfect rebound has a COR of 1 and would, in theory, bounce forever. A ball that doesn't bounce at all has a COR of zero.

Here are data for three Titleist balls, averaged from three balls of each model:

Previous methods to measure COR were either very inaccurate, or required elaborate and expensive equipment. This revolutionary pocket-sized instrument easily gives laboratory-quality results that until now were beyond the means of the average golfer.

To use this tester, it is only necessary to drop the ball on a hard surface, allowing it to bounce three times. The internal microphone "hears" the bounces; the microprocessor uses mathematics and physics to calculate the COR. COR is immediately displayed to 0.1% accuracy on the LCD; additional tests can be done immediately.

Differences in drop height result in small differences in the COR value. To make the BestBall even more accurate, we have included a small correction for air viscosity effects resulting from different drop heights.