HMT (Head Measurement Technology) combines with the GC2 to precisely capture club head data with an ease and accuracy never before seen. With HMT, the most comprehensive analysis of a player's swing and club head performance is now at your fingertips. Instantly see critical data such as club head speed, horizontal club path, smash factor, dynamic loft, and lie—even impact location—with the same unmatched accuracy you're used to in the GC2. https://www.foresightsports.com/hmt-head-measurement