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14-01-2007, 04:53 PM

Please help, when you do calibration on your PH pen, would you use both PH 4 solution and PH 7 solution or...... either one will do?

Thank you very much.

14-01-2007, 04:53 PM	#1
thuac Guest Posts: n/a	PH Pen calibration Please help, when you do calibration on your PH pen, would you use both PH 4 solution and PH 7 solution or...... either one will do? Thank you very much.