Abstract: An apparatus for determining a predicted distance that a golf ball will travel when struck by a putter club head during a putting swing. A first optical sensor is located in a first position for sensing when the putter club head travels over the first position during the putting swing. A second optical sensor is located in a second position for sensing when the putter club head travels over the second position during the putting swing. The second position is a predetermined distance away from the first position. A timer, coupled to the first and second optical sensors, is provided for generating a time difference value representing a difference between a first time when the putter club head travels over the first position during the putting swing and a second time when the putter club head travels over the second position during the putting swing. A microprocessor is provided for determining the predicted distance in accordance with the time difference value and the predetermined distance.