Upgrade from you soda can chrono to this inexpensive yet high quality chronograph from Swiss Arms. Features multiple function modes including rate of fire and velocity. This Chrono can quantify your Velocity in Meters per Second or Feet per Second. Also, this chrono can determine muzzle energy in Joules for both .20g and .25g BBs. Wireless, battery operated functionality enables this chrono to be used at even the most remote skirmish sites.