To an outsider, it was a dense thicket of calibrations, temperature corrections, and ionic strength adjustments. To Elara, it was poetry. The standard demanded that a buffer’s pH be measured with an uncertainty of no more than ±0.02 units. Two hundredths of a single step on a logarithmic scale. The difference between life and cellular collapse.
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The number held. For one full minute, the display did not waver. ph eur 5.17.2 pdf