Sper Scientific 850069 Environmental Quality Meter w/Sound - Manual (Page 12)

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SOUND CALIBRATION
The meter enters Calibration Mode and
displays two values. The upper value
is the calibration point. The lower
value is the current reading.
Note…
To calibrate the sound meter, you must
change the current reading to match
the calibration point of the acoustical
calibrator (e.g., 94 dB). Press POWER
at any time to cancel the calibration
procedure.
6. Press °C/°F to increase the calibration
point value or press Function to
decrease the value to match the
desired calibration setting.
7. Press MAX/MIN to accept the
calibration point. The meter display
flashes to indicate that the meter is
ready to save the calibration data.