The F-1 Chrony® Ballistic Chronograph fits your needs for shooting accuracy at an affordable price. This compact, portable chronograph determines the velocity of anything you shoot with greater than 99.5% accuracy at velocities from 30 to 7,000 F.P.S. The F-1 Chrony converts the time it takes the shot to pass through to velocity in F.P.S., and gives you an instant readout. Durably constructed of 20-gauge steel yet weighs under 3 lbs. Uses one 9V battery (not included). Take it with you anywhere, unfold it, insert diffusers (if required) and you can start shooting and judging your accuracy in less than 2 minutes. Works on either a tripod mount (not included) or a tabletop.