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A brief summary of the objections to the relational nature of inertial mass,gravitational mass and electric charge is presented. The objections are refutedby showing that the measurement process of comparing an instrument referenceclock and a reference rod both obeying the laws of physics to a system obeyingthe same laws of physics results in relational quantities: inertial mass,gravitational mass and electric charge appear only as ratios. This means thatscaling of the absolute inertial mass of every object in the universe by thesame factor is unobservable (likewise for gravitational mass and electriccharge). It is shown that the measurement process does not separate theinstrument parameters from the system parameters. Instead a measurementproduces functions of fundamental, dimensionless parameters such as the finestructure constant, electron-proton mass ratio and the proton gyro-magneticfactor. It is shown that the measurement of Planck's constant also results insuch a function of these dimensionless parameters. Application of this analysisto the "absolute" Planck units shows that they too are functions only ofrelational quantities. Analysis focuses initially on non-relativistic systemsfor the sake of clarity and simplicity. The results are then extended torelativistic systems described by the Dirac equation and the Einstein fieldequations of general relativity. The results support the assertion thatinstrument parameters cannot be separated from system parameters even inclassical mechanics.

System parameters and measurement instrument parameters are not separately observable: Relational mass is observable while absolute mass is not