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Calibration of pH probe

My pinpoint pH probe arrived today and there's no directions for calibrating 
it.  There are directions on the calibration packets that read, "Immerese 
probe into solution."  Ummm...ok....so do it before I connect the probe to 
the controller or after?  How long is it supposed to say immersed?  How 
often will I need to re-calibrate?  I got packets of 4.000 and 7.000. I 
assumed this is what I needed after reading posts.

Thanks again everybody for your help,


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