You have a 3-way probe. TE, pitot and static.
Blow gently in the red tube and have a helper tell you which hole(s)
the air comes from. I suspect it will be the set of holes around the
horizonal part of the probe - the static holes.
The hole in the tip is the pitot and the hole(s) in the short sideways
tube is the TE.

Have your helper use their eye to feel the air, that way you need to
blow quite gently.

-Tom