I have the same meter, infact two of them. One is not really enough. To really make life easier you need to buy or borrow another. This is also helpfull for measuring wash out and identifying warps (not that Ive ever had any warps). You plce on at the wing root the other at the wing tip.

As far as your original problem goes you would put one on the wing and the other on the stab.

I started out with one meter but eventually bought another.