What does a "Calibration Void" label signify?

A "Calibration Void" label signifies that the device is preventing tampering. This label serves as an indicator that the integrity of the device's calibration has been compromised or is at risk if unauthorized access occurs. The presence of such a label implies that measures have been taken to ensure that the calibration remains intact and unaltered, which is critical for devices that need to maintain precise measurements or performance standards. It acts as a protective measure designed to assure users that the device can be trusted to operate within specified parameters, related to quality assurance and regulatory compliance.

The other options pertain to the condition or status of the device, rather than its security against tampering. A label indicating immediate maintenance would suggest an active issue, while stating the device is functioning correctly relates to operational status rather than calibration security. The mention of scheduled calibration may seem relevant but does not convey the protective aspect that the "Calibration Void" label signifies.