I am doing some routine maintainance and calibrating my pH probe (Aquacontroller lab grade) which is about 9 months old. It is taking a lot of time for the probe to settle to the 7.0 level. Does this indicate a bad probe or something? It has been 15 minutes and it is slowly dropping like 0.01 every minute. Thanks.
pH Probe Calibration Question
- Thread starter eengmd
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