Rifle Scopes Are March scopes waterproof?

I'm no optics guru, but I believe that if an optic is fogproof, it is sealed, thus also waterproof. However, a waterproof scope isn't necessarily fogproof, as it could be sealed without the oxygen being purged and replaced with nitrogen or argon.

At the bottom of the spec sheet on this link, indication is that all March scopes are argon gas filled:

http://www.deon.co.jp/march/Scope-Spec.pdf

So I'll speculate that March scopes are indeed waterproof.


(Didn't see Mr. Kelbly's post prior to mine, but I'll leave mine anyway. He surely knows the correct answer.)