Do I need an new ph probe?

[hitechboy]

What is the normal response time for the ph probe? If I take it out from a tank of 6.7 ph and put it in fresh tap water of 7.3 ph. How long will it take to get a stable reading?

When should I replace the probe?

Thanks in advance!

[GHL Support]

The average lifetime of a ph-sensor is around from half a year to one year.
What does your ADC-values show?

[hitechboy]

Adc1=688; adc2=122

[Matthias]

this values seem okay - but they only indicate the "freshness" of your probe if calibrated recently
settling time can be some minutes