Section: V1M2, Section 22.214.171.124
d) Temperature measuring devices shall be calibrated or verified at least annually. Calibration or verification shall be performed using a recognized National Metrology Institute traceable reference, such as NIST, when available.
Question: do reference thermometers need to be calibrated annually? These are traceable to NIST.
TNI FINAL RESPONSE:
As long as the reference thermometer is not being used as a piece of support equipment such as described in 126.96.36.199 c, a reference thermometer is a reference standard as described in 188.8.131.52 and would need to be calibrated before and after any adjustment, and in accordance with the lab’s documented procedure.