Gauges & Rulers

Jonell Bowling Ball Span Gauge Best span ruler/gauge Gets true span by eliminating bevel from thumb or finger holes

Jonell Pitch Gauges For determining pitch on all sizes of holes. Comes with plastic storage case. Set of two, one for thumb and one for fingers.

Pro Shop Starter Kit Included in set is Turbo Pro Sect Quarter Scale, an Armadillo, Jonell Span Gauge and a Span Ruler with stud.

Jonell Bowling Ball Span Gauge Best span ruler/gauge Gets true span by eliminating bevel from thumb or finger holes

Innovative 6 inch Span Ruler Flexible steel for maximum durability 1/2" post allows for accurate true span measurement Very accurate with marks to 1/16" increments

Ebonite Machinist Ruler 6" stainless steel flat rule can be shaped to the contour of a bowling ball. Increments of 32nds and 64ths provide extremely accurate span measurements. Useful conversion chart from fractions to decimals etched on backside.

Classic Pitch Gauges - set of 3 Set of 3 gauges enables the user to check any size hole accurately Spring loaded gauges spring forward, reverse and lateral (side) pitch