The Caldwell Ballistic Precision Chronograph is a must have for a variety of shooters. Provides velocity readings from speeds of 5 to 9,999 fps within .25 percent accuracy. Higher accuracy is achieved by using a high speed 48 MHz processor and calibrating every unit after assembly before it leaves the factory. The chronograph still remains simple to use, providing a readout of velocity in feet per second or meters per second on a large LCD screen. Extra wide sun screens are included for shading in full sun operation along with a 1/4-20 threaded insert on the bottom of the housing for use with a tripod. The chronograph can also deliver the shot string velocity data through the included 15 foot audio jack cable to your smartphone/mobile device. A free App (https://itunes.apple.com/us/app/caldwell-ballistic-precision/id659981375?mt=8), (https://play.google.com/store/apps/details?id=com.battenfeld.chrono&hl=en) is available for download that displays the velocity of each shot as well as other data identifying the load and environmental conditions.