Metrohm pH electrodes designed to be used with Chemglass reactors and data loggers. All electrodes are supplied with integrated PT 1000 sensor for temperature correction and have a BNC connector. 12mm Shaft Diameter, 300mm Usable Shaft Length, 20mm Minimum Immersion Length, Glass Shaft Material, Fixed Cable Electrode Head, 0 to 100°C Temperature Range.12mm OD probes designed to go directly into smaller reactors using the standard taper joint adapters (CG-1872-A-01 through CG-1872-A-03).