Caldwell Ballistic Precision Chronograph G2 -The light sensors were spaced 18" apart for more accuracy and the sunscreens have self-contained LED lights when a little extra light is needed. Collapsible and compact, the system is quick and easily deployed from its heavy duty storage case. Higher accuracy was achieved by using a high speed 48 MHz processor and by designing a circuit with an advanced data interface that allows each unit to be computer calibrated at the factory after assembly. The end result is the ability to provide much better accuracy than other chronographs on the market (+/- .25%) and measures from 5 to 9,999 FPS. 18 sensor spacing for maximum accuracyEach unit factory calibrated to within +/- 0.25% accuracyBuilt in LED Light KitBluetooth to interface with SmartphoneRechargeable Lithium Ion BatteryIdeal for Firearms, Archery, Airgun or PaintballMeters Per Second (MPS) or Feet Per Second (FPS) readingsApp displays velocity, logs data, notes, weather conditions and easily exports via SMS or EmailCarry bag includedHeavy Duty height adjustable from 15-42 TripodIncludes 1/4-20 dovetail plate to attach to the chronograph for quick assemblyModel-720002