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When i purchased the probe and calibrated it the 1st time ever, numbers were a bit jumpy before they stabilised, but this time it actually stabilised very quick, i still wait 2 to 3 min or till i notice no change on the numbers for a full min. 1st time mv was on the money, but this time i...

Just finished recalibrating the probe *again* after acclimating the packets and honestly is reading lower than before. I think that i will use it for 6 months and get a replacement, not sure. After the calibration i did test against the packets and all the readings were close, just a few...

Thank you, i will try it again tomorrow by dipping the 7/10/4 packets in the sump to have the same temperature than my sump (Normally 77F to 78F) and hope for the best. I forgot to mention that my PH reading was at 8.37 before the calibration and after it was 8.07, so there is something...

I just calibrated my PH probe after 1 year, tried it twise and this were my results (See attached). Some of the other threads mencion, if the result is in red, the probe is bad. Please correct me on this before i go buy a new one. The only reason i calibrated all three points is because in the...