I’m looking at a wall I know is leaking, and has moldy wet cellulose in two stud bays. It’s definitely mold, the smell is very strong.
I have three tools available: a pin moisture meter, a non-contact moisture meter, and an IR camera (a low end Flir One). I’m unable to detect much of any difference between the wet stud bays and the dry ones.
Possibly this is because the cellulose holds a lot of water, but is inconsistently wet. I’m finding the first inch or so against the wet sheathing is soaking wet, but the stuff near the wall is pretty dry. The exterior is stucco.
Or… is there a way to use the tools for this task?