The basic fundamental physical constants can be expressed in terms of Planck constants: of the length, of the mass, of the time. Also, in units of measurements: meter, kilogram, and second, can be expressed electromagnetism units of measure, for example, amperes, volts, ... See, for example, article: ELECTRIC CHARGE AS A FUNCTION OF THE MOMENT OF MASS. GRAVITATIONAL FORM OF COULOMB'S LAW. https://hal.archives-ouvertes.fr/hal-01374611v1 To improve the accuracy of Planck's constants, it is proposed to relate the characteristics of a hypothetical Planck particle and the characteristics of a muon. See, for example, articles: FRACTAL GENESIS OF THE ANGLES OF THE NEUTRINO MIXING MATRIX. https://hal.archives-ouvertes.fr/hal-01782443v1 FRACTAL STRUCTURE OF THE FUNDAMENTAL CONSTANTS. NUMERICAL EVALUATION OF THE VALUES OF SOME OF THE FUNDAMENTAL CONSTANTS WITH USE OF THE MAJOR CHARACTERISTICS OF MUON. https://hal.archives-ouvertes.fr/hal-01581300v1 This approach allows for increasing the accuracy of the fundamental physical constants. See preprint: Improving the accuracy of the numerical values of the estimates some fundamental physical constants. https://hal.archives-ouvertes.fr/hal-02117148v1