Our Measuring Balls have two thumb holes: one is used with our built in span scale (incremented in 1/16") for determining proper span, while the other one allows you to rotate the bowler's thumb to determine the proper oval angle. The rest of the balls surface contains 42 holes in 1/64" increments to help determine the proper holes sizes needed for the bowler.
MoRich Fitting Tubes are sold in pairs of two: one for large hands and one for smaller hands. By placing the bowler's middle and ring fingers on either side of the proper line on the tube's scale, the bowler will wrap his palm and thumb around the tube where another scale on the opposite side of the tube which will measure the way the bowler's thumb hinges. This scale will tell you the correct lateral thumb pitch for "this" bowler. These fitting tools are the best tools available to accurately determine lateral thumb pitches by accurately measuring the hinge of the bowler's thumb.