How do companies that make measuring tools like rulers make sure the product is accurate? Is there a universally ruler that is used to check? How do they make sure the measurements are exact?
In: Engineering
Rulers, in particular, are “accurate enough” for their use. Many wooden rulers are stamped with the lines and numbers, so a few careful measurements are copied over and over. The piece of wood is “about a foot”. Plastic rulers, again are measured when their extruder template is made and the metal form is “accurate enough” when used to make the final product.
Tl;dr – most every day measuring devices are not exact, but they are good enough.
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