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Recommended Use: pH of soft, moist surfaces both solid and semi-solid such as agar gel plates, meats, bread dough and similar samples. Small samples in micro sample dish. The Orion ROSS pH electrode, which is recognized as the best pH electrode in the world for difficult samples, is now even better. The Orion ROSS Ultra has twice the warranty and greater stability than its predecessor. It uses a unique reference system developed by Thermo Scientific that offers longer life, greater stability, and fast results, regardless of sample composition or temperature.