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The mass is a fundamental property of an atom comprising all information on its constituents and their interactions. Thus, it carries information on the internal structure of the nucleus, reveal the quantum mechanical shell structure within complex nuclei and determine the energy available for nuclear transformations in radioactive decay processes. Mass measurements allow us to benchmark nuclear models and thus contribute to investigations of the nature of the strong interaction itself. This talk will deal with two mass spectrometers developed for measurement of mass of superheavy nuclei. Both are different and each use for the measurement other physical principle. First is called MASHA (Mass Analyzer of SuperHeavy Atoms) and is currently operational. Second one will be MR-TOF MS (Multiple-reflection time-of-flight mass spectrometer), which is being built in Flerov Laboratory of Nuclear Reactions.