This electrolyte analyzer is suitable for measure of the contents of K+, Na+, Cl-, Ca2+ in the samples of human serum, plasma (whole blood) and diluted urine and pH value (only for use of calibrating calcium ion, not for result of human acid-base balance) and for providing the results of standardized ionized calcium (nCa), total calcium (TCa) through calculation. It can also determine the contents of K+, Na+, Clin the diluted urine.