Golf Shop: GOLFSMITH Lie Board

"Special hitting surface material (the same as on our Dynamic Lie Angle Test Platform) leaves a small temporary mark on the sole of the clubhead indicating lie angle at impact. For best results, have the golfer stand level with the board, which is 1/8 thick. - Durable; size is 7 1/2 x 15 7/8 - Works with or without tape."