Can a reasonable observable operator be defined which measures a two-component observable, first component for the approximate coordinate and the second for the approximate momentum (so that the precision of each measurement do not contradict Heisenberg inequality)? I am actually thinking of how to define formally a problem of measuring of the particle speed inside a barrier (for quantum tunneling effect), i.e. can we reasonably ask what is the momentum of the particle inside the barrier? We, of course, can ask what is the average momentum or a momentum distribution, but what about asking what is the momentum IF the particle COULD BE found in some region? Can this sort of problems be reasonably interpreted in the terms of QM?