What step is essential immediately before testing with the Intoxilyzer 8000?

Confirming the device shows a ready status is essential immediately before testing with the Intoxilyzer 8000 because this status indicates that the device is properly calibrated, functioning correctly, and prepared to perform accurate measurements. This step ensures the reliability of the test results by verifying that the device is in optimal condition to conduct breath analysis. If the device does not indicate a ready status, it could lead to inaccurate readings and potentially compromise the testing process.

While performing a visual inspection can be valuable as a general practice, it is not as critical as confirming the ready status, which directly relates to the operational state of the device. Changing the device's batteries is typically part of routine maintenance and not a step taken immediately before each individual test. Reviewing the operator's manual serves as a reference for procedures and troubleshooting but does not directly impact the immediate readiness of the device for testing.