What is the significance of using a gas standard for the Dry Cal Chk?

Using a gas standard for the Dry Cal Check is fundamentally important for calibrating the instrument. Calibration ensures that the Intoxilyzer 9000 accurately measures the concentration of alcohol in a breath sample. The gas standard, which is a known concentration of alcohol in the air, allows for the verification that the instrument's readings are precise and reliable. This process helps maintain the integrity of the test results by confirming that the device is functioning correctly and producing consistent output. Proper calibration ultimately protects the validity of the testing process, ensuring that any legal or medical decisions based on these measurements are based on accurate data.