What type of testing maintenance is required after a specified number of tests?

Routine calibration checks are essential for ensuring the accuracy and validity of the Intoxilyzer 9000's results. These checks are conducted after a specified number of tests to confirm that the device continues to function properly and provide reliable data. Regular calibration is critical in maintaining the integrity of the testing process, as factors such as wear, environmental conditions, and variations in the control standards can affect the device’s performance.

In contrast, complete replacement of parts is not a standard requirement after a specified number of tests; it is typically guided by specific failure or malfunction indications rather than a set number of tests performed. Annual performance audits serve as a broader assessment of the device’s compliance and functionality but are not tied directly to the immediate maintenance needs that arise from conducting frequent tests. Visual inspections are beneficial for monitoring the physical condition of the device but do not provide the quantitative assessment necessary to ensure accurate testing results in the same way that calibration checks do.