If I remember correctly the putter scale is based on easy or standard green speed's? So the 15 scale should putt it 15 feet. Assuming flat green, what is a some what close percentage for the other green speeds? In other words the 15 scale on X green speed will go X far. Anyone know the percentage gain as you go up in green speeds?
Nevermind, I just remembered YankeeJim gave me a link yesterday. Hey, its 5am and I am old. Memory is slow :-P