The unknown absolute scale of the neutrino mass remains an outstanding problem in astro and particle physics. The Project 8 collaboration aims to measure the effective neutrino mass related to the anti-electron neutrino using the tritium endpoint method if it is larger than 40 meV/c^2. To achieve this goal, Project 8 has pioneered the CRES (Cyclotron Radiation Emission Spectroscopy) technique, which is based on the Einstein equation E=mc^2. Adopting a four-phased approach, in Phase II Project 8 has recorded the first CRES tritium spectrum and extracted the first frequency-based neutrino mass limit. This milestone has established CRES as a promising method for direct neutrino mass measurement. In Phase II, Project 8 also recorded high-resolution CRES spectra of Kr-83m conversion electrons, a calibration source that is widely used in low-energy particle detectors and tritium endpoint direct neutrino mass measurements. Based on the high-resolution spectra, we performed measurements of the the energy of the 32-keV gamma photon emitted in the Kr-83m transitions and the binding energies of the Kr shell electrons. In particular, the CRES-based measurements here of the L1, L2, L3, M1, M2, M3 binding energies achieved higher precision than the literature values. We will also show that the high-resolution CRES spectra provide a nice way to visualize the Einstein equation, which CRES is based on.