- Made with aluminum and stainless steel, this device has high-quality parts for reliable and accurate results with little error.- It has a large area that can sense movement easily and is very sensitive.- Easy to use, with a big LCD screen that shows speed in meters per second (MPS), feet per second (FPS), or energy in Joules.- It accurately measures the speed of bullets, arrows, and other objects like ping pong balls, and badminton shuttlecocks, and can be used for science experiments about speed or falling objects.