Any one have an idea why my PH calibration is acting this way.....what i mean is when i try to do a manual calibration at 4.00 or 7.00 can't get the reading to change off from 8.02 even if I use 4.03, 7.00, or 10.00 calibration solution, however if i move on to the second stage (10.00) of calibration which is 10.00 the readings change depending on the calibration solution used meaning (4.03, 7.00, 10.00)
I have done a manual calibration without any probe hooked up, did an apex update, what else could i try?
The problem only seems to be with calibrating the first stage at (4.00 or 7.00)
Thanks!!
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