Abstract: The paintball loader of the present invention includes a housing having a hopper for holding a supply of paintballs. An outlet tube connected to the hopper is adapted to be connected to the inlet tube of a paintball gun. Located within the hopper is an electric motor-operated agitator capable of directing paintballs within the hopper toward the outlet tube so that the paintballs can pass through the outlet tube and into the inlet tube of the paintball gun. A sensing system located at least partially within the outlet tube senses the movement of paintballs through the outlet tube. The sensing system includes a rotatable wheel having a plurality of angularly spaced apart radially extending members. The wheel is rotatably mounted relative to the outlet tube such that paintballs passing through the tube engage the radially extending members and cause the wheel to rotate. A plurality of magnets carried by the wheel pass by a Hall effect sensor mounted on the housing as the wheel is rotated.