The Sinclair Chamber Length Gauge allows handloaders to measure the actual chamber length from the bolt face to the end of the chamber's neck, which may differ from published trim lengths.
Made of 12L14 soft steel, the gauge is inserted into a fired case and will not damage the chamber, providing a reusable tool for accurate measurements.
Specific caliber limitations apply; the 45 Caliber gauge does not work on thin-necked or tight-necked cases, and is not suitable for use in handguns, semi-automatic, lever, or pump action rifles.