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
The manufacturer will have a “standard” which is usually an object made of a stable metal that corresponds to the measurement they are trying to reproduce, and those standards are accurate copies of another standard, and so on and so forth, traced back to a single object that sets the standard for everyone. They then use those standards to check the accuracy of their product.
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