Range finder from ww2

[Frøya]

Hello. I found something tucked away in my grandfathers attic, and was hoping for some help in evaluating what it is and what kind of value there might be to the items. It was a wooden box with, well, a small Nazi symbol on it, and inside there seems to be a rangefinder with the same symbol and a lot of extra stuff; lenses and such. There was also some kind of binoculars too, with the writing ZL 3x8 Flak on it. This piece doesn’t seem to belong with the other items. Everything seems to be in very good condition, no rust or anything.
If there’s any value here, and how would I go about selling this? I’m located in Norway.
Thanks in advance for your feedback.