Diameter: 0.84 inches, Origin: USA, Directly replaces select Japanese brands (fine tube) oxygen probes. Oxygen probes utilize zirconia ceramic sensitive elements to measure oxygen content in various application environments. ZrO2 is a typical ionic crystal. When ZrO2 is doped with divalent or trivalent cubic symmetric oxides such as CaO, MgO, Y2O3, and other trivalent rare earth oxides, it becomes a fast ion conductor for oxygen at temperatures above 600°C, and is referred to as a solid electrolyte.

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