The Meter we chose must fit to the Scale. It must be able to give information about where along the Scale quantifier the Stakeholder Value or Product Quality is, just like a speedometer is able to tell us how fast our car is traveling.
The Scale gives us a variable, the Meter tells us where we are on that variable.
The Scale has no direct Cost, the Meter often has, as it usually is a physical thing that requires some Action or a Process carried out by humans.
To verify that we have a useful Meter, we can apply the Meter, if it tells us where along the Scale quantifier we are, the Meter might be useful.
Meters have variable:
3. time taken Before they give us the results