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As to obtain whichever related information about the molecular formula, there are numerous of mass spectrometry applications accessible either web-based or windows-based systems as to calculate the isotope patterns. Additionally, most of the applications are capable to display the mass spectrum as to gain related information on molecules and the particular relative intensity. We have developed TIG as an alternative towards isotope pattern calculator, reinforcing the concept of calculating isotope pattern by using the Cartesian Products. In this paper, we provide an evaluation result for the isotope pattern calculator; Theoretical Isotope Generator (TIG). It is also shown from the evaluation that TIG provides an insight of the related field as well as what should be possessed to be an ideal isotope pattern calculator principally for educational purposes.