Golf is a game of slopes and vectors. So many variables – wind, lie, ruffage – affect a shot's outcome that judging the best approach can be extremely tricky. With the help of a laser range finder, a player can eliminate one unknown: distance to the pin. Bushnell's V3 Tour is accurate to within a yard and vibrates when it has locked on to a target. The slope edition also calculates elevation changes, presenting the golfer with both the actual distance and the effective yardage. Think of it as a graphing calculator for duffers. [$338;]