Getting precise diameters with a circometre
If you've ever tried to wrap a standard yellow tape measure around a large pipe to find its diameter, you know exactly why the circometre exists. It's one of those niche tools that seems a bit overkill until the moment you actually need to be accurate within a fraction of a millimeter. Standard tapes are great for hanging pictures or measuring a room, but they're notoriously clunky when you're dealing with round objects. You end up fumbling with the math, trying to divide by 3.1415 in your head while holding a slippery metal hook, and usually, the result is "close enough" rather than "dead on." ...