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The quality of fixed-point cells is influenced by several factors during the manufacturing process, such as metal purity, vacuum control, and temperature control. It is important to evaluate the cells after they are manufactured to ensure quality. Most of the possible quality problems coming from the manufacturing process can be detected by cell testing and evaluation. Procedures for testing the freezing plateau as a quality check is described in the paper, including comparing against reference cells. A method for calculating metal purity from the test data is discussed. Calculations of metal purity were verified by chemical analysis, and the results are presented in the paper.