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Ph meter calibration solutions


The world's cheapest man just bought a pH meter and it
needs calibration. I don't want to shell out $10 each
plus shipping for calibration solution though. Does
anyone know of recipies for homemade alternatives? I
have a lot of chemicals available and measuring
equipment. I did find one on line using boric acid
that gives a pH of 9.18. I could particularly use one
around pH 7.


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