This is the new version of the well known and one of the best and most accurate chronographs on hte market. Xcortech are the ones we use in our workshop and at the skirmish site. XCORTECH X3200 is a high quality, multi-function and precise measuring device used for measuring muzzle velocity of BBs fired from airsoft replicas with a caliber of 6 mm and 8 mm. The device is powered by two AA batteries (not included in the set), which allows it to be easily carried and used in the field. Compact size and low weight paired with high functionality. Micro USB power port only to power the unit cannot be charged using USB. Improved measurement accuracy, and reliability. Lowered by 2 AA batteries, previous model required 3 x AAA batteries. MK3 model has 14 sensors, previous model had only 8. Low power consumption. Extended operation time on a set of batteries. Standard tripod mounting