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    Standard captions

    PH-Metrica. Verification Certificate (PH 12.43)
    PH-Metrica. Verification Certificate (PH 12.43)
    PH-Metrica. Verification Certificate (PH 9.18)
    PH-Metrica. Verification Certificate (PH 6.86)
    PH-Metrica. Verification Certificate (PH 4.01)
    pH-Metrica. Verification Certificate (PH 3.56)
    pH-Metrica. Verification Certificate (PH 1.65)
    Certificate of approval of the type of measuring instruments (Standard pH titers 2 and 3 categories ST-12)