Smell-o-meter

Perhaps the American Library Association should commission high tech wizards to develop a "smell-o-meter" which could standardize our judgments.

1997 May 7, William Greene, misc.fitness.weights, Usenet Somebody needs to invent a "smell-o-meter" for gyms

In other words, the wolf scent that is old, though it registers on the deer’s “smell-o-meter,” causes a far different behavioral reaction than one that is fresh.