12x pH buffer powder calibration sachet solution mix 4.00 250ml mixer

Value pack of pH Buffers.  Pack contains

12 x pH 4.00 sachets

pH sachets with correct granule mixture to make up 250mL of buffer solution.
Ready to mix with 250ml of distilled or demineralised water
Has an indefinite shelf life
Accuracy : 0.01pH at 25C

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