ST-200 aQua Electrolyte Analyzer is a semi-automated, microprocessor controlled electrolyte system that uses current ISE technology to make electrolyte measurements. The ST-200 aQua product measures various combinations of Sodium, Potassium, Ionized Calcium, Ionized Magnesium, Lithium, pH and Chloride in whole blood, serum, plasma, CSF, body fluids and urine.