Thermo Fisher Scientific EcoScan DO 6 - Manual (Page 56)

Instruction Manual DO 6
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momentarily show the measured reading based on the last calibration before
displaying the last offset adjusted value.
6) Use the ▲ and ▼ keys to enter the new value.
7) Press the HOLD/ENTER key to confirm the offset adjustment. “CO” will be
displayed for 1.5 seconds before the display returns to the subgroup
menu.
8) Press CAL key to exit the Set UP menu to return to the measurement
mode.
Note: When a user calibration is done, the offset gets reset to zero.