Each membrane of a pH electrode has its own composition, bulb configuration and thickness. Therefore, carefully study the specifications and suggestions in this section to select the most suitable electrode for your application. SP10B pH, epoxy, sealed, 0...13 pH, 0...80°C SP10T pH + ATC, epoxy, sealed, 0...13 pH, 0...80°C SP20B pH, glass, sealed, 0...13 pH, 0...100°C SP20T pH + ATC, glass, sealed, 0...13 pH, 0...100°C SK10B conductivity, epoxy, 0...80°C, 1 cm-1 SK10T conductivity + ATC, epoxy, 0...80°C, 1 cm-1 SK40T conductivity + ATC, epoxy, 4-pole, 0.6 cm-1, 0...80°C SK20B conductivity, glass, 0...100°C, 1 cm-1 SK20T conductivity + ATC, glass, 0...100°C, 1 cm-1 SK21T conductivity + ATC, glass, 0...100°C, 0.1 cm-1 SK23T conductivity + ATC, glass, 0...100°C, 10 cm-1 SK41T conductivity + ATC, glass, 4-pole, 1 cm-1, 0...100°C SK24T conductivity + ATC, glass, 0...100°C, 1 cm-1, 6 mm diameter SZ10T dissolved oxygen + ATC, epoxy, 0...50°C, 3 m cable ST10N temperature, Pt1000, stainless steel, -30...+130°C ST20N temperature, Pt1000, glass, -30...+130°C