I just connected my second PH probe to my apex using the existing ORP port. I conducted the calibration using the 4 and 7 calibration fluid packs. When I placed the second probe in the sump (next to the first PH Probe), wow guess what, I got 2 different readings. The first probe was calibrated using the 7 low and 10 high calibration fluids. The PH 2 probe is reading 7.9 while the PH 1 probe is reading 7.7. Could it be the level of calibration fluids ie. 4/7 vs. 7/10. Both are lab grade. PH 2 probe is brand new. Ph 1 is a few years old.
Anyone else experienced this?
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