The Xero® C1 Pro chronograph makes ballistics calculations easy. This compact device fits in your back pocket, measures projectile velocities from 100 fps to 5,000 fps and provides the data you need to refine your equipment. Set up is simple and intuitive, thanks to the button-operated design. Compare velocity for every shot fired, track deviation and more in the ShotView™ smartphone app. It's built to last, thanks to its IPX7 water-resistant rating. With up to 6 hours of battery life, you'll have plenty of time at the range.