My normal method for ....? Well, the "usual" is to keep the raincoat unbuttoned but held close around me; to walk in front of an unsuspecting ...
Wait ... Do you mean "Photographic Exposure"?
I use a lot of Incident metering in the Studio, with the Gossen UltraPro and the "Studio Incident Metering" attachment. That has proven to be the most accurate method, being independent of the "brightness" - or lack of, of the subject.
I'll use "reflective" - including "spot", metering where I cannot get to the position of the "subject.
Did I read something here about a different mathematical algorithm used in determining the relation between "Incident" and "Reflective-Spot" metering? :