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Originally Posted by WWWD
hey sam how often do you callibrate your meter? i dont think i ever have since i bought it. how off could my meter be?
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I don't know. I need it because I was playing around with the calibration. I couldn't believe that our tap water was less than 5 ppm as that was what it had been reading since I bought it. So I played with the calibration screw. Now, I've messed it up and want to recalibrate.