Lots of golfers have different swings, but we all need to hit the ball in the same spot: the middle of the club. The Trackman 4 launch monitor can help ensure you do so with every swing. It has dual radar systems built into its portable, six-pound body: one that watches your impact, and another that watches your ball flight. A quad-core Intel processor and a 1080p camera keep an eye on things, recording metrics like club path, face angle, clubhead speed, ball speed, carry, launch angle, and spin rate. It connects to iPads and iPhones wirelessly, letting you get real-time feedback and suggestions on how to improve. All of which helps explain why you'll find them on the practice ranges and tee boxes of any tour event.