One of the smartest purchases I made for my youth baseball team was my Sports Radar 3600. I use this gun in my practices and also use a radar that is at our local batting cage facility (that is a much pricier radar) and I found them to be very close to each other in the speeds they are registering. I do not use my radar to see how hard the kids are throwing, I use the radar to check on pitch speed differentials between fastballs, curveballs, and change-ups. Changing speeds is one of the most critical things a pitcher needs to do. If a pitcher only has one speed, no matter how hard, eventually good hitters will get their timing on it. We spend a lot of time at practice measuring the speed of the fastball and then making sure the off speed pitches are 6-10 MPH slower than their fastball. The Sports Radar 3600 is very accurate in measuring this. Additionally, it is very light weight and portable to take to practices.
This radar is one of the best $285 investments I have made. I have gotten numerous years out of it and it has been a critical tool in working with my pitchers. Also, the kids just think it is cool to see who throws the hardest on the team!