20pcs! 4.00，4.0， 4.01， 6.86， 7.0， 9.18， 10.1 PH Measure Calibration Solution Buffer Powder  water quality measurement tools

Feature:
100% new and high quality
As this is a powder， in a sealed packet there is no "shelf life".
The contents will make up to 250ml each.
Just add water or distilled water
Use for PH tester measure calibration solution

PH buffers to use:
Selected from the deionized water， and boiled for 15 to 30 minutes in advance， to remove dissolved carbon dioxide. If there is no preparation conditions can also be used distilled water， distilled water distilled twice better， cut the plastic bag the reagent into the beaker ， With the amount of deionized water to dissolve and wash bags， then poured into 250ml volumetric flask， diluted to the mark， shake well then， poured into a sample bottle label use.
Specification: PH = 4.00， pH = 4.01， pH = 6.86， pH = 7.0， pH = 9.18， pH = 9.18 (both Please note that you need specifications， can be mixed to buy)

Package Includes:
20 x PH Buffer Powder

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