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Strips, pH range 2 to 9, pH indicators and test papers Universal indicator papers have been impregnated with a mixture of several indicators. On contact with the sample solution they assume a particular color. A check against the supplied color comparision table allows the pH to be determined.
Here you can find the cartificat: https://www.gelifesciences.com/en/de/support/quality/certificates
Regular Price: €16.00
Special Price €12.40
Regular Price: €119.15
Special Price €107.24