The new, versatile Paintball Radarchron Rate-of-Fire is designed to help keep paintball markers shooting within safe limits for paintball speed and rate-of-fire. It is a small, affordable Doppler radar that measures the shot characteristics of the latest state-of-the-art paintball markers capable of shooting bursts of paintballs at high rates of fire, as well as single shot markers. It will display the maximum, minimum and average velocity of balls shot in a burst, from a minimum of 150 feet per second to over 450 feet per second. It will display the maximum, minimum and average rate-of-fire for paintballs shot in a burst, from a minimum of three balls per second to over thirty balls per second. . It will display the number of balls shot in the burst, from one up to 255 balls. It will also display the velocity of a single paintball shot from a marker within the maximum and minimum velocities stated above.