What condition must be met regarding the temperature measuring device during accuracy verification?

For the accuracy verification of a temperature measuring device, it is essential that it must be verified annually or whenever there is a question regarding its accuracy. This ensures that the device continues to provide reliable measurements over time, which is critical in both laboratory and industrial settings. Regular verification helps to identify any drift in performance and allows for timely adjustments or recalibration, should they be necessary.

Periodic checks are part of maintaining quality assurance standards and achieving compliance with industry regulations. The need for annual verification also acknowledges that various factors, such as usage, environmental changes, and aging of components, can affect measurement accuracy. By establishing a consistent schedule for verification, users can ensure that their temperature measurements remain valid and trustworthy.

While cleaning the device, calibrating at certain conditions, or obtaining third-party certification may be important aspects of device maintenance and compliance, the core requirement focused on accuracy verification is regular assessment to confirm that the device is still performing accurately.