PH4.01 & PH7.00 and 3M KCl each with 250ml Precise calibration: The accuracy of pH 0.015 allows highly accurate calibration Simple: using the colours can be recognised the right solution by the (PH4: Red; pH7: Green) Immediate use: instead of dissolving powder in distilled water, you can immediately use the solution Long lifetime: up to 3 years shelf life.
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