Thermo Fisher Scientific EcoScan DO 6 - Manual (Page 26)

Instruction Manual DO 6
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blink and the display will show a value which is with respect to the factory
default calibration.
NOTES:
When calibration is attempted on a factory calibrated absolute value
measurement of 10.1% to 49.9%, the display will show the absolute value
measurement for 1.5 seconds before displaying Err.1 and goes to the
measurement mode.
5) Press the HOLD/ENTER key to confirm the calibration. The meter displays
“CO” for 1.5 seconds and automatically calibrates to 100.0% air saturation
and returns to measurement mode.
Note: You can offset your % DO calibration. See Section 7.7 (OFS.6) %
Saturation Offset Adjustment for directions.