The ROSS Ultra stability gives you ±0.01 pH accuracy even over a long period of time. Using a nonmetallic reference system, the liquid-liquid equilibration occurs almost instantaneously, saving time plus ensuring accurate results. Complex, delicate samples, such as biological media, foods, and pharmaceuticals, measure easily without metallic contamination of the sample or excessive cleaning. ROSS Ultra electrodes are refillable—easily accommodating a change in filling solution for samples sensitive to potassium or chloride ions. Choose ROSS Ultra pH/ATC Triodes for applications requiring built-in temperature compensation.