sevo
Fokutorendaburando
Seconded. But neither approach is any use for shadow detail if the subect tonal range is long. The only way to be sure of shadow detail is to read the darkest area in which you want texture and detail, and key the exposure to that.
If you are able to get close or have something to do a equivalent reading on, any reflective meter will do. Beyond that, it is spot meter time.