This set includes three sachets of powdered pH calibration solution: one sachet at pH 9.18, one sachet at pH 6.86, and one at pH 4.01. Add the contents of one sachet to 250mL of distilled water for best results, then mix well for one minute and allow to sit for 5 additional minutes. This set is intended for use with our pH tester and C-600 meter and will help you complete pH calibration when necessary.
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