Offset Bay, Dayton’s Iron-Offset Caliper

Field notes

The measurement process uses the hosel axis as a fixed datum and records the leading-edge gap in millimeters across an entire set. The page gives blade irons a near-zero-to-2-mm range and cavity GI irons a typical 4-to-8-mm range, then adds a wet-mat test intended to approximate damp Great Miami turf. It also says the customer receives a mill sheet showing the set’s lag curve rather than a single club measurement.