pH calibration question frrom RC
Dalmerjd writes
I just got my Profilux +2 and was setting it up. I began the pH probe calibration and ran into a problem. As we know the probe is to be calibrated using the supplied 7 and 9 pH buffer fluid. All was going well until I hit the enter key after setting the 9 pH second calibration point. I got this message:"Calib.Val.Diffe Too Small". I presume this translates into: Calibration Value Difference Too Small. I was then returned to the basic display.
How do I fix this? Why won't it do this calibration? It will accept a 10 pH as a second point but not a 9. I tried changing the calibration tolerance and the same problem. I tried shutting off the sensor and resetting the hour meter to zero...no difference.
What do I do?
I have sent a video clip of what I am doing. I don't think I'm setting both to the same.
