How many calibration checks are included in the testing sequence on the Intoxilyzer 9000?

The Intoxilyzer 9000 testing sequence includes two calibration checks as a part of its operational procedure. This is critical for ensuring the accuracy and reliability of the breath alcohol measurement results. The two calibration checks generally occur at the beginning and end of the testing sequence. By incorporating two checks, the device can effectively confirm that it is functioning correctly and that the readings provided during the testing phase are valid and trustworthy. Having multiple checks helps maintain the integrity of the testing process and assists in identifying any potential issues with the device's performance.