Thermo Fisher Scientific C101 Colorimeter - Manual (Page 52)

Calibration: pH
C401/301/101 Colorimeter
48
NOTE: If you wish to abort this calibration
process, do NOT press the READ/ENTER key as
in step 16. Press the ZERO key instead. The
meter will display [AbRT] and CAL annunciator to
signify that the calibration has been aborted
without saving the calibration value. The meter
will then return to the beginning of the user
calibration as in step 3.
NOTE: If an error occurs during calibration, the display will present an error
message. Please refer to Section 4
Troubleshooting Guide for details.
CAL