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Hey Randy!
I'm measuring through the APEX probe. I went through the calibration process with the packets it came with. The unit is brand new.
Thanks
Tom
Hey all thanks for the advice! I had a red sea PH test kit and there's about a .3 difference in the probe and the test kit. I ordered the calibration packets once they come in I'm going to check them against my probe and probably recalibrate. I found my air exchanger in the basement was off. So I turned that on and have been leaving the cabinet doors open. Ph has been sitting between 8.1 and 8.2 ( after I add the .3). I think I'm in good shape! Thanks again!!