314-75 Potassium Mono ION Selective ElectrodeElectrode for a variety of applications including tap water, soil, wine etc About Potassium Mono ION Selective Electrode This electrode requires a separate reference electrode. Applications Ideal for applications where greater accuracy is required (especially when ION levels are low). Waste water Tap water Saliva Fertiliser Soil Wine Specifications Dimensions: 120 x 12mm Concentration Range: 1M 10 8M Lower Limits (ppm): 0. 04 Ref. Electrode: R2 Temp