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Origin of Precision A glass-body, semi-micro combination pH electrode with S7 screw head. Designed for small sample volumes like test tubes and vials. Small shaft for small samples The slim shaft diameter allows measurements of very small sample volumes. ARGENTHALTM - For a long electrode life The ARGENTHALTM reference system uses silver-ion-free electrolyte. Thereby is no danger of the junction becoming blocked by sulfides or proteins. Flexible connectivity The S7 sensor head offers flexibility and can easily be connected to any meter.