How often should thermometers be calibrated against the NIST thermometer?

Thermometers should be calibrated against the National Institute of Standards and Technology (NIST) thermometer annually to ensure accuracy in temperature measurements. This annual calibration process is important because it helps maintain the reliability of the measurements used in clinical and laboratory settings, where precise temperature readings are crucial for processes such as specimen storage, test accuracy, and patient safety.

Over time, thermometers can become less accurate due to wear and environmental factors, so regular calibration helps identify any deviations from the standard. By calibrating annually, laboratories can proactively address any inaccuracies that may develop, ensuring compliance with quality standards and regulatory requirements.

Calibration frequencies shorter than a year may be unnecessarily frequent for most applications, while those longer may not adequately maintain accuracy, highlighting the balance that annual calibration achieves for effective temperature monitoring and management.