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About High-Quality Rulers
What separates a throwaway ruler from one you’ll keep for decades, which type is best for everyday use, and how to compare materials.
Circumference-Measuring Rulers
Finding the circumference of duct, pipe, and other cylindrical objects is as easy as pi. Just measure the diameter of the object's opening with the inch scale, then look at the measurement below—that's your circumference. Since you only need access to the opening, these rulers are ideal for pipe and duct that are already mounted. A favorite among sheet metal workers, they're also known as tinners' rules.
Steel
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Tempered for extra strength, these rulers keep their shape even after multiple hard hits and drops, so they'll measure accurately for years to come. Their graduations are etched and filled with black ink, meaning they won't rub off like printed graduations can.
