When does the inspector mechanic check the calibration of a tint meter?

The correct answer is that the inspector mechanic should check the calibration of a tint meter before every use. This practice ensures that the meter provides accurate measurements of window tint levels, which is crucial for complying with state laws regarding tint regulations. Regularly checking the calibration prevents any inaccuracies that could lead to improper judgments about whether a vehicle meets legal standards. Calibration adjustments are often necessary due to environmental factors, wear and tear, or other variables that could affect the performance of the meter over time. Thus, verifying calibration before use is a vital step in maintaining the integrity of the inspection process and ensuring public safety.