Review on TrueShot Golf Alignment Tool - Magnetic Lie Angle Aid for Golf Swing Training by Jon Lewis

This tool shows very clearly where the club is pointing. This is particularly useful when examining while lying on a slope. For example, it is often hard to believe how far the left viewpoints are on the slope (above your feet). I wonder why the ball flies even further to the left than you thought? This will help you appreciate the impact of face alignment. Of course, instructors find it useful, but I bought it as a player for my own training.