After calibrating a thermostat, what is the recommended step to secure the adjustment?

Painting the adjustment screws with nail polish is a widely accepted practice for securing the adjustment of a thermostat after calibration. This method serves as a visual deterrent against unauthorized changes, as it makes it clear if someone has tampered with the settings. By applying nail polish, anyone who checks the thermostat can easily see if the calibration has been altered, as the seal will be broken.

Using tape, though it might seem convenient, can be less effective because it may peel off or become damaged over time, allowing for adjustments without clear evidence. Leaving the thermostat unsealed provides no assurance that the calibration remains unchanged, which could lead to inaccurate temperature settings and potential equipment failures. Marking it with a pen may indicate the position, but it does not effectively prevent adjustments, leaving the calibration vulnerable to change.

Therefore, the practice of using nail polish to secure adjustment screws combines a simple yet effective solution that maintains the integrity of the calibration while ensuring evidence of tampering is visible.