How often do I have to calibrate APEX PH probe?

[Fr4nkthet4nk]

I bought My APEX 7 month ago. I want to know if I need to recalibrate my PH Probe and how often?

Thank you in Advance

 

[DLHDesign]

I calibrate my probe after every cleaning - which I find is needed every 2 months or so. That may be more often than needed, but the calibration solutions are cheap (~$4 for one set?) and the cost of the probe being out-of-calibration is too high.

 

[Fr4nkthet4nk]

I calibrate my probe after every cleaning - which I find is needed every 2 months or so. That may be more often than needed, but the calibration solutions are cheap (~$4 for one set?) and the cost of the probe being out-of-calibration is too high.

Thank you!

 

[DLHDesign]

Welcome. Another option would be to test the Ph using some other means and calibrate it when the values are not aligned. This relies on having (and performing) an accurate test - and having a test that has a small enough variance that you'll be able to spot any issues. And, really, at that point you've likely spent the same as the cost of the calibration fluid...