Each Shooting Chrony® Chronograph measures the speed of cartridges, arrows, shotgun pellets, airgun pellets, paintballs, etc. in a range of 30 FPS to 7000 FPS (feet per second) with an accuracy of over 99.5%. The Chrony® can be used almost anywhere. It just needs to be unfolded, attached to a tripod or placed on a table and (if necessary) equipped with diffusers. It can be shot in less than 2 minutes.