The green contours books used by players and caddies on the PGA Tour each week are incredibly sophisticated (and, as a result, quite expensive, too). Veteran caddie Kenny Harms gives you an inside look at his green contours book from East Lake Golf Club and explains that though it may cost a pretty penny, it is definitely money well spent.
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Greens books should be outlawed. They severely slow the game down and take away from the skill and art of the game.
Greens books? No
Rangefinders? Yes
Speed up play please!