Dayton Audio OmniMic V2 Precision Measurement System - Manual (Page 6)

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browse to where you stored your ".omm" file. Then click "Apply".
Or if you are connected online with the computer you are using with OmniMic, click the "Web" button,
enter the Version 2 code, and Omnimic will do the rest.
.
Sensitivity Readjustment
Over time, the sensitivity of microphones can drift to some degree. Provided reasonable care is
taken to avoid exposure to high temperatures or humidity, their frequency response shapes typically
remain stable, but if maximum level accuracy is required, you can trim the system senstivity relative
to the value already included within the Calibration Code.
The sensitivity of the microphone can be checked with a trusted microphone calibrator and the
OmniMic SPL/Spectrum display. If it is found to be in error, the senstivity can be adjusted by up to
several decibels with the control that appears when you select "Config>Adjust" from the menu at the
top of the screen.