Hey there J I didn't think that they needed to be calibrated. I have a inline one too that is connected to my RO/DI lines one going from the membrane out and one for the DI out. Let me know what you come up with ok.. I might have to calibrate mine too. Had it for like 2005 til now and never new that it had to be calibrated... 
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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