4.01 pH Buffer Solution
Product ID: 9128
For precise calibration of pH meter.
Use this 4.01 pH solution when calibrating the pH meter for measurements below 5.0 pH. Also use it with the 7.01 pH solution for a two point calibration which improves the accuracy. Includes five 20-ml sachets.
https://www.johnnyseeds.com/tools-supplies/test-measuring-equipment/4.01-ph-buffer-solution-9128.0.html
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