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The Orion No Cal electrode will hold its calibration to ± 0.10 pH unit for one year, as long as the simple storage and care requirements are met. These electrodes utilize a unique reference system that allows for quick and accurate measurement of pH in the field. Just take it out of its storage chamber, put it in your sample and measure.Thermo Scientific introduces the Orion No Cal pH electrode; the first pH electrode that does not require a calibration! This pH electrode's revolutionary design is such that it is ready to measure at any time with no need for a time-consuming calibration. Furthermore, the No Cal electrode will work in virtually every sample type from wastewater to protein-based samples. Combination electrode with Epoxy Body. Recommended Use: Field pH measurement where stability and high performance is desired and when a pH electrode that doesn't require calibration is needed.