Review on TrueShot Golf Alignment Tool - Magnetic Lie Angle Aid for Golf Swing Training by Loren Schmidt

Features a magnet that comes out of a pole. It magnetically sticks to your racquet. It gives you a visual representation of which direction your ball should be moving based on the angle of impact. If you had a decently powerful magnet that would fit in any small diameter pipe, you could make one of these yourself, although I doubt it. You would save a lot of money if you didn't have the magnet and tube in your house. Basically, it's a good way to see and understand the attic. What it isn't is that you can attach it to your racquet and then swing. move around at swing speed to see where your club is pointing at any point along the swing path - although this allows you to get feedback by swinging in slow motion.