Datalogic Matrix 300 Reference Manual page 25

RAPID CONFIGURATION
4. Select a Calibration Mode choice and press the "Calibrate" button. The reader flashes
once acquiring the image and auto determines the best exposure and gain settings.
5. Press the "Fine Focusing" button to activate the Focus procedure.
The reader continuously acquires images and gives visual feedback on the focusing
quality in the Focusing Tool window.
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