Patent ID: 7731598

Claim:
A golf club, comprising: a shaft having a shaft axis; and a scale disposed on the shaft, the scale including: an arm having a first end, a second end, and a medial portion between the first and second ends, a fixed reference indicia disposed adjacent the arm and extending approximately parallel to the shaft axis, and a pivot support defining a pivot point for the arm and supporting the arm at its medial portion such that the arm can freely rotate within a plane and about the pivot support, wherein the reference indicia extends through the pivot point and at least one of the first end and the second end when the golf club is placed on a zero-slope surface, and wherein when the golf club is placed on a sloped surface, the arm is adapted to displace by an angle relative to the shaft, the angle being proportional to the degree of slope of the surface; and a pivot lock for manually engaging the pivot support and arm, such that with the lock engaged the arm is fixed in rotation relative to the reference indicia and with the lock disengaged the arm is free to rotate relative to the reference indicia.