Caldwell Ballistic Precision Chronograph with FPS and MPS Readings, Sun Screens and Large LCD Screen for Range Shooting ACCURACY: Each unit is factory calibrated within +/- 0.25% EASE OF USE: Measures Meters per Second (MPS) and 5 to 9,999 Feet per Second (FPS) VERSATILITY: Ideal for firearms, archery, airgun and paintball rifles RELIABLE: Wide sun screens for increase readability in full sun and a large LCD display for easy readability CONVENIENT: Operates on 9v batteries (not included) and features a 15ft audio jack cable to deliver data to your smartphone (iPhone, iPad, iPod Touch, Android 2.1 or newer smartphones and Kindle Fire Tablets) - features 1/4-20 threads for tripod mounting