A trigger pull gauge is one of those accessories that is not used often, but is often used to great effect. After all, one of the best upgrades for accuracy is often the trigger. The pull on some triggers feels harder or softer than than they really are. Adjustable triggers may be tuned to be optimized for a specific use, but it takes more than guess work. I have also know savvy consumers who shopped for used firearms with a trigger gauge. It can tell you as much about a gun as a bore light.