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
There is an organization in a lot of countries that defines standards and specifies measurement technologies to insure those standards are met. In the US, for example, that organization is the NIST (National Institute of Standards and Technology). You can hire [calibration services](https://www.nist.gov/calibrations) that will check the measurement on a piece of manufacturing or inspection services to insure that your machine that is manufacturing the parts is accurate to within any tolerance you might specify.
Most high volume manufacturing processes are extremely repeatable within a tolerance, and once you’ve inspected it once, you can be assured that future parts will be the same (within the tolerance of the process).
Latest Answers