How often do probes/electrodes need replacement?

[wojo]

hi there, like title says i would like to know how often do probes for PH or ORP need replacement.

thanks.

 

[mbbuna]

this thread should help

http://www.reefcentral.com/forums/showthread.php?s=&threadid=675635&highlight=orp+probe+replacement

 

[wojo]

thanks mbbuna, so if the probe can still be calibrated its still good? the reason i ask is i just purached an ozonizer which is 2 years old and it has original probe on it. not sure if i should replace it or not...

thanks for your help

 

[BeanAnimal]

As long as you can calibrate and the probe it is fine. You will find that it will begin to drift more and/or not calibrate after time.