The Labradar Chronograph is an exceptional velocity acquisition system. It continually measures velocities of your rifle, pistol, shotgun (slugs), arrows (with add-on accessories not included) or pellets up to 100 yards, depending upon the size of the projectile. Smaller bullets do not track as far as large bullets. Multiple distances for velocity display are user definable on the unit. LabRadar measures velocities up to 3,900 f.p.s. with 0.1% accuracy using six AA batteries or an external power pack (included in rental). The best feature of the Labradar is that it’s not dependent on any light source and can be used indoors or outdoors, day or night, in all weather conditions. In use, it is positioned to the side of the weapon where it can be easily read and adjusted. This keeps it out of harm and more user friendly. Each shot series provides Hi, Lo, Average, ES (extreme spread), SD (standard deviation). Individual shots display velocities at the muzzle and at up to five additional distances along with Kinetic Energy at each distance. The data is downloadable via USB or SD card. The unit mounts on standard ¼ x 20 tripod thread, however, the tripod is not included. If you need a tripod, we recommend the Leofoto LX-254 – it’s a good match for the LabRadar.