Golf club length is easily checked with the correct ruler, but even with the right tools, there are different ways to interpret the information depending on the person doing the measuring. Each method ...

You're on a par-3 tee and the shot you're facing is either a hard 7-iron or soft 6-iron. You're between clubs, so to speak. The 7-iron might get you there and the 6-iron might put you above the hole ...