What is NIST Traceability?
Traceability can be defined as an unbroken chain of measurements and associated uncertainties.
A tested device will have traceability to NIST standards if the following conditions are met:
- An unbroken chain of measurements back to NIST standards is maintained.
- Each step of the chain has known and documented uncertainties.
- There is a quality system to ensure that the thermometers and associated measurement equipment maintain their measurement uncertainty (accuracy).
Information here sourced from the nist.gov website.