What is the primary function of the ODG-1 outer diameter gauge?
The ODG-1 checks that a cap fits within its largest reference hole, serving as a pass/fail outer-diameter verification tool for closures.

How does the ODG-1 perform its pass/fail check?
The ODG-1 is a dual-hole go/no-go gauge: the crown cap must fit into the larger hole (go) and must not fit into the smaller hole (no-go). A cap that passes both conditions meets the outer-diameter specification, while any deviation immediately flags a non-conformity.

In which industry and with which instruments is the ODG-1 typically used?
The ODG-1 is used in crown cap manufacturing and beer and beverage bottling lines, typically alongside the IDG-1 internal diameter gauge and the HDC Crown Cap Height and Thickness Gauge to perform a complete crown cap dimensional compliance check.