Frequently Asked Questions
Q: What is a micro-inch or a micron?
A: In our shop we use a simple diagram to show the size
difference between a human hair, a microinch, and a micron.
Q: What is uncertainty?
A: The calculation of uncertainty for a measurement is an effort to set reasonable bounds for the measurement result according to standardized rules. Since every measurement produces only an estimate of the answer, the primary requisite of an uncertainty statement is to inform the reader of how sure the writer is that the answer is in a certain range.
Q: What is traceability?
A: Traceability is the property of the result of a measurement or the value of a standard whereby it can be related to stated references, usually national or international standards, through an unbroken chain of comparisons, all having stated uncertainties.
Q: What is NIST?
A: NIST, an agency of the U.S. Department of Commerce, was founded in 1901 as the nation's first federal physical science research laboratory. Over the years, the scientists and technical staff at NIST have made solid contributions to image processing, DNA diagnostic "chips," smoke detectors, and automated error-correcting software for machine tools.
Q: Why don't I need a NIST number?
A: For questions about NIST numbers and more information, click here.
Q: What class of instrument do I need?
A: A 4:1 – 10:1 ratio is recommended from your master to your artifact