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Ion selective electrode standards are used in analytical chemistry, biochemical, and biophysical research, where real time measurements of ionic concentration in an aqueous solution are required. These include probes that measure specific ions and gases in solution. The most commonly used ISE is the pH probe. Other ions that can be measured include fluoride, bromide, cadmium, and gases in solution such as ammonia, carbon dioxide, and nitrogen oxide. Spectrum ion selective electrode standards are prepared using the highest quality ingredients and precise analytical methods. Trust your ingredients when you purchase from Spectrum.