Hello Neville,
When using single point calibration you generally use a calibration solution that is close to what you are trying to measure. If your solutions are close to a PH of 7, the 7.01 calibration solution will work well. If you are measuring over a wide range of PH, you would typically do a triple point calibration using calibration solutions of PH 4, PH 7 and PH 10. One nice thing about the triple point calibration is that it alerts you when your PH probe is wearing out. Tom From: Neville Munn [mailto:one.red...@hotmail.com] Sent: Saturday, February 19, 2011 4:57 PM To: silver-list@eskimo.com Subject: CS>pH calibration fluid? Can someone help me out here re: specifically a *single point* calibration? If one does not need to calibrate below base 7 or below in the acidic range, is a buffer solution of 7.01 adequate? I know one can calibrate to determine ranges between two desired figures, but using two buffer solutions would only be required if measuring both adicity *and* alkalinity would it not? If measuring *above* 7.0 only, or in the alkaline range, I would assume two calibration points would not be necessary as the reading would/should never go below 7 in this instance...Yes/No? Thanks N.
