Which label is used for instruments that are unreliable?

In the context of instrument labeling, the Out of Calibration (OOC) label is specifically designed to indicate that an instrument is unreliable for measurement purposes. When instruments are subjected to calibration processes, they should meet specified standards to ensure accuracy. If an instrument fails to meet these standards during calibration, it is tagged with the OOC label to alert users that it cannot be trusted for precise measurements until it has been recalibrated and verified for accuracy.

This label serves an important function in ensuring safety and the integrity of operations, particularly in engineering and technical environments where precise measurements are crucial. The OOC label effectively communicates that the instrument is not functioning within acceptable parameters, thus preventing potential errors in data collection or machine operation.