EyeLine Golf Stroke Meter (learn to associate backswing with distance)

EyeLine Golf Stroke Meter Putting Aid - By Todd Sones
The goal of the Stroke Meter is to help you develop a stroke that is the same length back and through, at a consistent rate of acceleration.
Simply swing the putter to the same colour on both sides of the ball, practicing different distance putts, and the colour blocks on the board let you see equal distances back and through. The Stroke Meter helps you create the proper stroke length – see it, feel it, repeat it.