The only way to test your Airgun, Firearm or Ammunition, a chronograph is a must have for the competitive shooter. With the tried, tested and trusted products from Shooting Chrony you can accuratley measure the ballistics of any gun, ammunition or projectiles. These advanced devices allow you to measure speeds from from 30 to 7000 fps. The Gamna Shooting Chrony is also a very practical device with all its component parts folding into its neat steel chasis. Setup is simple too, mount the F1 chronograph on a tripod or table, attach the sky screens and off you go. Build with a quality folding steel chasis Runs off a single 9 volt alkaline battery with a runtime of approximately 48 hours continuous use Threaded for tripod use Large LCD readout Folded Size: 7" Length, 4" Width, 2" Depth Measures the speed of bullets, arrows, shotgun and airgun pellets, paintballs, etc, from 30 feet per second to 7000 feet per second.