Solid state electrode for analyzing fluoridated water supplies, titrating of fluoride complexes in solution, studying fluoride metabolism in plants and animals, and controlling and monitoring of fluoride waste discharge into streams. Ions measurable from saturated to 10-6 M and 0.02 ppm. The half-cell electrode is made of unbreakable, acid/base-resistant epoxy. 1 m cable length. Temperature range: 0 to 80°C. Length: 152 mm. Use with reference electrode 659-420-02.