Abstract: A bat, constructed generally of the shape, weight and material usually used and formed for the batter is provided so as to have a small diameter stream of light extended through the central axis from one end to the other. The formation of the light stream emitting out the knob end of the bat will allow the batter to correctly align the knob of the bat with the ball during the initial movement of a swing. The batter and his/her coach will then be able to determine if there are errors in the player's angular position of the bat relative to the ball.