Impact Marking Decals
"These labels are imperative for correctly fitting length and lie.
Knowing exactly where and how the ball contacts the face of the club can eliminate many unknowns in deductive club fitting. If the ball impression is elliptical and the dimples are smeared, the ball is not being hit squarely.
Example: The impact decal shows a mark toward the heel - the ball starts left, usually fades, loses distance and has an unsolid feel."