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Origin of Precision A combination pH electrode with PEEK shaft and S7 screw head. Designed for general applications in the lab and outdoor; robust and maintenance-free. For the toughest conditions PEEK shaft with excellent chemical and mechanical resistance, a real heavy-duty sensor. Junction-Free, Worry-Free Thanks to the solid XEROLYT® reference electrolyte, no membrane junction is needed. No junction, no clogging. Flexible connectivity The S7 sensor head offers flexibility and can easily be connected to any meter.