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Shooting Chrony F-1 Chronograph (green). A Shooting Chrony chronograph can measure velocities for airguns and firearms, including powerful firearms. F-1 CHRONY - The very first model and still the most popular. Provides numbered shots and velocities plus high, low and average velocities of the string. All Chrony models are powered by a single 9V battery and can be easily attached to a 1/4"-20 tpi camera tripod for fast, easy set up. The Chrony is simple to use, just unfold the box, set the sky screens in place with the diffusers, turn on the switch and start shooting.