On a natural definition of the kilogram and the ampere

We consider a recent proposal [1] to redefine the kilogram in terms of natural constants. In our opinion, the main objective of the redefinition should be to build such a version of the SI system in which the electric measurements are possible with the highest accuracy in SI units, and not in practical units as now. We emphasize that this objective can be achieved only with a simultaneous redefinition of the kilogram and ampere. This redefinition must be in terms of fixed values of the Planck constant h and the elementary charge e. Certain details of the possible redefinition are considered. This paper considers the recent proposal [1] to redefine the SI kilogram and possibly the ampere in terms of fixed values of fundamental physical constants. This would change the International System of units (the SI) [2], which is a commonly accepted coherent system for all branches of macroscopic measurements in education, sciences and technology. The redefinition [1], which has been suggested in terms of fundamental constants, also indirectly involves certain natural quantum phenomena, which should appear due to realizations of the redefinition. Some time ago the SI was changed in a similar matter by fixing a value of the speed of light c [3]. However, the present situation is very different. To our opinion the major problem now is that the present high-accuracy