What is the maximum allowed accuracy deviation for a window tint meter?

The maximum allowed accuracy deviation for a window tint meter is +/- 2%. This standard is essential as it ensures that measurements taken to assess compliance with window tint regulations are accurate and reliable. The accuracy of the meter is crucial for evaluating how much light is being transmitted through the tinted windows, which must adhere to specific legal limits. A deviation of 2% provides a reasonable margin of error, ensuring that the readings remain within acceptable limits for enforcement and safety standards. This precision is important for both the inspectors conducting the tests and the vehicle owners who need to comply with state laws regarding window tinting. Properly calibrated meters help to maintain fair and uniform application of those laws.