Angle Porting’s Choke Gauge is CNC machined from solid aluminum bar stock with an anodized finish that won't score or damage the choke tube and easily checks 20 and 12 gauge choke tubes of factory bore shotguns. The convenient key ring attaches to the 20/12 Choke Gauge to a gun bag.

The Choke Gauge is easy to use by simply selecting either 20 or 12 gauge marked on the Choke Gauge and inserting it into the choke tube until it stops at a gauge mark giving a correct reading.