  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.
