PROBLEM CAUSE SOLUTION
Calibration error.
Buffer value does not match
displayed value or electrode is
disconnected or failing.
Use fresh buffer solutions.
Check electrode connection.
Clean & recondition electrode.
Replace electrode.
Broken or worn electrode Replace electrode Unstable pH
reading
External ‘noises’ or induction
(electrical ‘noise’ caused by a
nearby motor)
Remove or switch off interfering device
Slow response Dirty electrode. Clean & rehydrate the electrode
CAL
during pH CAL
mode
Calibration was attempted
using only 1-point that was not
pH 7 (USA) or pH 6.86 (NIST).
Recalibrate using 2 or more pH points
or use pH 7 (USA)
or use pH 6.86 (NIST).
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