Thermo Scientific Orion® Fluoride Electrode with Waterproof BNC Connector 5 to 7 pH. Thermo Scientific Orion® Combination Fluoride Electrodes measure free fluoride ions in aqueous solutions quickly, simply, accurately and economically. The sure-flow junction in the combination fluoride electrode allow easy cleaning of the electrode junction and are easy to use in tough samples. Half cell fluoride electrodes allow you to use a separate reference electrode that can be used with other pH or half cell electrodes. Free flowing sure-flow junction assures stable, drift free potentials. When conventional electrode junctions clog, the sure-flow junction can be opened and flushed clean simply by pressing the cap. Fluoride half cell electrode used in conjunction with the single junction reference electrode offers the benefits of the sure-flow junction design. Material: epoxy. Cable length: 1m. Probe internal resistance: 150 to 200 kilo ohms. Concentration range: Saturated to 10-6M, saturated to 0.02 ppm. pH range: pH 5 to 7 at 10-6M (0.02 ppm F-). Reproducibility: +/-2%. Temperature range: 0 to 80°C continuous use, 0 to 100°C intermittent use (32 to 176°F continuous use; 32 to 212°F Intermittent use). Outside diameter: 13mm. Body length: 110mm. Per each. Thermo Scientific Orion® #: 9609BNWP.