Posted: 8/19/2011 from Bakersfield, CA UNITED STATES
I purchase both the 7.0 and the 4.0 ph calibration solution and they are very accurate.and what's good about both you can store them in a cool place and use them over.
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Posted: 5/16/2008 from SOUTH CHINA, ME UNITED STATES
A must for calibration.
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