Thermo Fisher Scientific Alpha pH 600 RF (In the process of updating the brand guideline & product image) - Manual (Page 17)

Mode Indicators
MEAS
Measurement mode; blinks in Symmetric mode
(Refer Section 3.1& 5.5 )
SETUP Setup mode (Refer Section 5)
CAL Calibration mode (Refer Section 4)
Status Annunciators
READY
Appears when the reading is stable
ATC Appears when Automatic Temperature Compensation (ATC) is
enabled.
Not visible when Manual Temperature Compensation (MTC) is
enabled.
Flashes if the temperature probe is faulty in its ATC mode.
(Refer Section 5.3)
ERR Appears when an error occurs (Eg. wrong key pressed)
Electrode annunciator. Appears when viewing electrode properties
or during calibration error
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Buffer annunciator. Appears in calibration mode
Units of Measurement Indicators
mV
Millivolt. Appears in ORP measurement / calibration modes
(Refer Section 3.1, 4.5)
R.mV Relative Millivolt
pH Appears in pH measurement/calibration modes
(Refer Section 3.1,4.3)
ºC Temperature in Celsius (Refer Section 5.3)
ºF Temperature in Fahrenheit (Refer Section 5.3)